Cheap Astronomy - Dear CA #134: Testing Asumptions

The 365 Days of Astronomy · Apr 28, 2026 · 15m

Taking nothing for granted.

Hosted by Steve Nerlich.

Dear Cheap Astronomy – Is space really empty?

Well, the universe is filled with stars, planets and galaxies, but sure all the big gaps between those things are mostly empty. Although, let's not forget dark matter. It's likely to have a wider and denser distribution than visible matter, since we think there's four times more of it than there is of light matter - but all we can really say is 'we think' since we can't see dark matter and we don't actually know what it is.

Dear Cheap Astronomy – Just how strange is reality?

So, this is an…