What is space made of? It’s complicated …

Astronomers have worked out that only about 5 per cent of our universe consists of baryons — the particles which make up atoms, which in turn make up molecules, which in turn make up everything we see, touch, smell, and taste.

more…

Tau.Neutrino said:

What is space made of? It’s complicated …

Astronomers have worked out that only about 5 per cent of our universe consists of baryons — the particles which make up atoms, which in turn make up molecules, which in turn make up everything we see, touch, smell, and taste.

more…

I like this. Totally true.

I haven’t heard of this before.

“Ionised hydrogen is almost totally invisible, except for one amazing feature: it makes things twinkle. … happens with galaxies, which produce radio waves. These waves are scattered by the electrons of the ionised hydrogen in exactly the same way as our own atmosphere scatters light from stars. Distant galaxies appear to twinkle, and that twinkling tells astronomers that space isn’t empty, but filled with incredibly diffuse ionised hydrogen.”

I like this one, too.