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Unsolved Mysteries of the Cosmos (and a Supermoon Too) · Star Trails: From Backyard Astronomy to Cosmic Wonder

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Howdy Star Gazers and welcome to Star Trails.
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I'm Drew and I'll be your guide to the night
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sky for the week of October 5th to the 11th.
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This week the bright harvest supermoon takes
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center stage, Saturn continues its evening rain,
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and autumn constellations emerge in full force.
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Later in the show we'll examine some truly weird
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stuff five unsolved mysteries of the cosmos Whether
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you're tuning in from the backyard the balcony
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or just your imagination I'm glad you're here.
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So find a cozy spot Let your eyes adjust and
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let's see what the sky holds for us this week
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Folks again, let me apologize for the lack of
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shows in September In addition to it being a
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very busy period at my day job, I had a birthday
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last month, and it's one of the ones that no
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one looks forward to. Age 50. And to be honest,
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this one put me in a bad place for a week or
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so. As I tried to stave off the imminent collapse
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of my own wave function, I looked to quantum
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physics for answers to life's questions. And
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here's what I landed on. 50 isn't a gateway to
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old age. It's proof of improbable survival against
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entropy, against chance, and against the noise
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of the universe. I like to think that the fact
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that I'm still here is a superposition of sorts.
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At least that's what I've been telling myself
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to stay sane. I'm also happy to report the weather
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here in the south has finally cooled off a little,
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and we're seeing clear skies in the evenings
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again. Hopefully that's been the case for you
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as well. Fall officially arrived last month,
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and that means it's time to dust off the binoculars
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and scopes as we enjoy longer, cooler nights.
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Your first target for observation this week is
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likely going to be the moon. The full moon arrives
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Monday night, and this is not only the harvest
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moon, but a supermoon, meaning it's slightly
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closer to Earth than usual and will look just
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a bit larger and brighter. For most of the week,
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the bright moon will wash out fainter deep sky
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objects, but it also gives us some spectacular
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lunar conjunctions with planets and star clusters.
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More on those in a moment. Now, last week in
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my brief update episode, I mistakenly said September's
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full moon was the Harvest Moon. That was an oversight
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on my part. The Harvest Moon can occur in either
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September or October. It's simply the full moon
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closest to the autumnal equinox. This year, October's
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full moon has that honor. The name of the Harvest
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Moon dates back to when farmers used to rely
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on this extra moonlight to bring in the last
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of the harvest after sunset. So what was September's
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full moon called? That was the corn or barley
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moon. Looking further out, Saturn continues to
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dominate the evening sky. It reached opposition
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just a couple weeks ago and it's still bright
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and well placed for observation. Step outside
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after sunset and look toward the southeast to
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find it. Tonight the moon slides close to Saturn
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making for a lovely pairing. Binoculars show
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them beautifully together and a moderately powered
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telescope will reveal Saturn's rings, although
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they may look a little thinner than expected.
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Saturn's thin rings this year aren't an illusion.
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They're a matter of Earth's changing vantage
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point. The planet's ring system is tilted about
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27 degrees relative to its orbit, and as Saturn
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moves around the Sun, we see that tilt from different
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angles. Roughly every 14 to 15 years, Earth passes
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through the plane of Saturn's rings, an event
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called a ring -plane crossing. Around these times,
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the rings appear edge -on and seem to disappear
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in small telescopes. They don't actually vanish,
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the rings are just extraordinarily thin, so they
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present almost no reflective surface when seen
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edge on. Fun side note, ring plane crossings
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often allow astronomers to spot some of Saturn's
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smaller moons that are normally lost in the ring's
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glare. So these periods are scientifically valuable,
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even if the visual show dims a bit. Later at
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night, Jupiter rises dazzling in the pre -dawn
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sky. It's a brilliant beacon currently in Gemini.
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Venus is also in the morning sky, hugging the
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eastern horizon before sunrise. If you have a
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flat view toward the east, you can't miss it.
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It's the brightest object in the sky after the
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moon. Mars and Mercury are too close to the Sun
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to observe this week. From October the 6th through
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the 10th, we get a visit from the draconid meteor
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shower. The predicted peak is the evening of
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Wednesday, October the 8th. This is an unusual
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shower because the best time to watch it is right
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after nightfall, not before dawn. The radiant
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is high in the northwest after sunset, so grab
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a chair, face away from the moon, and scan the
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sky during twilight's fade. The waning gibbous
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moon will drown out many of the fainter meteors,
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so expect just a handful per hour. But the draconids
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are famous for surprise outbursts, so it's worth
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a look. On the nights of October 9th and 10th,
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the moon passes very close to the Pleiades star
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cluster, also known as the Seven Sisters. For
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some observers in North America, the moon will
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actually occult or pass in front of several of
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the brighter stars in the cluster. If you have
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binoculars or a small telescope, this is a magical
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sight. Watch stars disappear behind the moon's
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bright limb and reappear on the dark side. As
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always, refer to a stargazing app like Sky Safari
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or Stellarium to see if this phenomenon is visible
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in your area. Summer's constellations are on
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their way out. By mid -evening, Pegasus stands
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tall in the east, marked by the Great Square.
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Trace a line from the Great Square into Andromeda,
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and you can find M31, the Andromeda galaxy. Visible
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in binoculars, even from suburban skies. Above
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Pegasus, Cassiopeia forms her distinctive W shape,
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which is a reliable signpost to M31 as well.
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The larger point of the W seems to form an arrow
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that points the way to M31. This is how I've
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always located the Andromeda galaxy. Meanwhile,
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Perseus and the double cluster rise in the northeast,
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a binocular favorite. To the south, the bright
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star Fomalot shines alone, low on the horizon,
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while the summer triangle still lingers in the
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west, slowly giving way to the stars of autumn.
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There's been another giant comet in the news.
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Comet 3I Atlas, also known as C2025N1, is the
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third confirmed interstellar object to enter
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our solar system, after Oumuamua and Borisov.
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Despite breathless headlines recently, this is
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not a naked eye spectacle. This week, it's actually
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too close to the sun in the evening sky to observe
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safely. The comet will reach perihelion on October
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29, then gradually reappear in the pre -dawn
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sky in December, mostly for large telescopes.
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Early Hubble data suggests a nucleus no larger
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than about 5 km, and its peak brightness is expected
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around magnitude 11 to 12. Faint, but scientifically
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thrilling. It's interstellar, after all. It's
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October, so that means it's time for some eerie
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topics. Imagine a smoke machine running, Robert
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Stack in his trench coat, and that creepy, synth
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-heavy theme whispering into the void. We're
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about to explore some unsolved mysteries of the
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cosmos. That's coming up after the break. Stay
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with us. Welcome back. The universe, vast, silent,
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filled with mysteries beyond imagination. Everywhere
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we look the cosmos is brimming with enigmas,
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riddles that defy our laws of physics and confound
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even the sharpest minds. They are the cold cases
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of astronomy, the unsolved puzzles of astrophysics.
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Tonight we open the cosmic case file, Five mysteries,
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each as unsettling as it is profound. These are
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the questions that haunt the night sky, waiting
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for answers that may change everything we think
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and know. Let's dim the lights and step into
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the shadows of the universe. the dark sector,
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matter and energy we cannot see. It begins with
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a crime of omission, a hidden force at work.
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Galaxies, those magnificent pinwheels of stars,
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are not behaving as they should. According to
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Newton, according to Einstein, stars at the edges
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should drift lazily, moving slower than those
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near the core. Instead, they whirl around at
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the same breakneck speed, as if an invisible
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hand is holding the galaxy together. That invisible
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hand is called dark matter. We can't see it,
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we can't touch it, but the evidence is overwhelming.
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Dark matter doesn't glow, reflect, or even absorb
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light, yet it outweighs the visible stars 5 to
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1, like a shadowy suspect. it makes its presence
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known only through its gravitational pull. And
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then there's its partner in mystery, dark energy.
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In 1998, astronomers studying distant exploding
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stars, supernova, noticed something shocking.
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The universe isn't just expanding. It's accelerating,
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as if some unseen energy is stretching the fabric
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of space itself. Dark matter and dark energy
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together make up about 95 % of the universe.
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95%. That means everything we see, stars, planets,
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gas clouds, even ourselves, amounts to a cosmic
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rounding error. Theories abound. Perhaps exotic
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particles are hiding in plain sight. Perhaps
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there are unseen dimensions warping the rules,
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or maybe the very laws of gravity need rewriting.
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But no experiment has yet revealed the culprit.
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Let's rewind the clock to the first second of
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the universe. The Big Bang should have created
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equal amounts of matter and antimatter. For every
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proton, an anti -proton. For every electron,
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a positron. Matter and antimatter are mirror
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images. Same mass, but with an opposite charge.
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When they meet, they annihilate, vanishing in
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a burst of light. By that logic, the universe
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should have destroyed itself almost instantly,
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yet it didn't. Somehow matter gained the upper
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hand, and antimatter vanished, and we are the
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survivors of that imbalance. But why? Physicists
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call this puzzle baryon asymmetry. The smoking
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gun lies in something known as CP violation.
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And here's the translation. C stands for charge
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conjugation. Swap a particle for its antiparticle.
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P stands for parity. Flip the universe like a
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mirror image. If the laws of physics were fair,
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a process should look the same under both flips,
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but experiments show that's not always true.
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In the 1960s, researchers found that certain
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subatomic particles Kions decayed differently
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than their antimatter twins. Nature had shown
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a preference. This CP violation is the universe's
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tiny cheat code favoring matter ever so slightly
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over antimatter. But here's the problem. The
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CP violation we've measured isn't strong enough
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to explain why the universe is filled with matter
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instead of just light. That's why physicists
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are chasing neutrinos. These ghostly particles
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able to slip through a trillion miles of lead
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unhindered may hold the answer. Neutrinos oscillate
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between different flavors, electron, muon, tau,
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and in doing so, they might break CP symmetry
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in ways far more dramatic than quarks do. If
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so, we'll finally know why matter won. Until
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then, the trail is cold. Case three black holes
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and the information paradox There is no greater
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locked room in the cosmos than a black hole Cross
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its boundary the event horizon and escape is
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impossible Gravity there is absolute light itself
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cannot flee Einstein's equations tell us matter
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falls inward, collapsing to a singularity, a
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point of infinite density. But infinities are
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the mathematician's red flag, a sign that our
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theories might be broken. What happens to the
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information carried by particles that fall in?
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Quantum mechanics says information can never
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be destroyed, yet black holes seem to erase it
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completely. This contradiction is called the
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information paradox. Stephen Hawking offered
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a clue. Black holes aren't perfectly black. They
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radiate faint amounts of energy, now called Hawking
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radiation, and slowly evaporate. If they vanish
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completely, what becomes of the information they
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devoured? Does it escape scrambled in the radiation?
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Is it somehow preserved on the surface of the
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event horizon like a cosmic hologram? Some theories
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suggest firewalls of energy at the event horizon,
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violent boundaries that incinerate matter instantly.
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Others propose that our universe itself may be
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holographic, and black holes are the proof. The
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Event Horizon Telescope gave us our first images
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of these beasts, shadows of darkness against
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glowing disks of gas. But their inner secrets
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remain sealed. Ultra High Energy Cosmic Rays
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Every second Earth is bombarded by cosmic rays,
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charged particles hurled through space at near
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light speed. Most are modest in energy, spawned
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by exploding stars. But sometimes a monster arrives,
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a cosmic ray with energies so vast it staggers
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belief. In 1991, one such particle hit a detector
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in Utah. Its energy was so extreme, more than
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10 to the 20th power, electron volts, that physicists
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nicknamed it the Oh My God particle. Packed into
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a single proton it carried as much energy as
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a baseball traveling at 90 kilometers per hour
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Imagine something that tiny carrying that much
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punch But here's the paradox physics says such
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particles shouldn't reach us on their journey
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They should collide with the faint glow of the
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cosmic microwave background That's the afterglow
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of the Big Bang and lose energy in the process
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This predicted cutoff is known as the GZK limit,
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and yet they arrive anyway. Where do they come
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from? Some point to active galactic nuclei, jets
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from supermassive black holes. Others suggest
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gamma ray bursts, the most violent explosions
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known. A few even whisper about exotic physics,
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remnants of the Big Bang itself decaying into
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cosmic bullets. Detectors like the Pierre Auger
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Observatory in Argentina and IceCube in Antarctica
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are on the case, scanning the skies. But the
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source remains unidentified. Case 5. The Hubble
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tension. At the heart of cosmology lies a deceptively
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simple number, the Hubble constant. the rate
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at which the universe expands. Measure it carefully
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and you know the age, size, and fate of the cosmos.
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But here the case takes a strange turn. Using
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the cosmic distance ladder, measuring Cepheid
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variable stars in certain supernova, astronomers
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get a value of about 73 kilometers per second
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per megaparsec. But when they measure the same
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expansion through the ancient light of the cosmic
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microwave background, they get 67. Two methods,
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two results, and they refuse to agree. This disagreement
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is known as the Hubble tension, and it's no minor
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discrepancy. The gap is now statistically significant,
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suggesting something fundamental is missing in
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our picture of the universe. Could there be new
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physics in the early universe, a hidden form
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of energy, early dark energy that vanished long
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ago, or subtle interactions between dark matter
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and neutrinos? If the tension holds, it means
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our standard cosmological model, the proud achievement
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of 20th century science, may be incomplete. The
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universe may still have surprises waiting. Five
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mysteries, five case files still open. The dark
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sector that hides 95 % of reality. The disappearance
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of antimatter, cheated out of existence by subtle
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violations of symmetry. Black holes, the cosmic
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vaults where information may vanish. Ultra -high
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-energy cosmic rays, impossible bullets from
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nowhere, and the Hubble tension, a crack in our
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cosmic foundation. Each of these is a shadow
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in the night sky, each a locked door daring us
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to find the key. With each new telescope, each
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detector buried in ice or lofted into orbit,
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the case grows warmer. And maybe one day, one
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of these mysteries will be solved. But for now,
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they remain the unsolved mysteries of the cosmos.
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If the stars spoke to you this week, or if a
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question's been on your mind, I'd love to hear
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it. Visit our website StarTrails .Show where
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you can contact me and explore past episodes.
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Be sure to follow us on Blue Sky and YouTube.
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Links are in the show notes. Until we meet again
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beneath the stars, Clear skies everyone.