It's big out there

[Fenderman]

http://preposterousuniverse.com/writings/cosmologyprimer/faq.html

 

[sushifiesta]

As soon as I posted it Mephistopheles I realised I'd answered a different question but you found a more appropriate answer anyway. It's all special relativity, time dilation etc. which is more than enough to give you a headache before you even consider general relativity.

 

[The Pits]

Peronally, I like the Douglas Adams school of physics.

In the beginning, there was nothing. Then it exploded