5
votes
1answer
1k views

How much sky do we see at any one moment?

When we look at any particular point the sky, what percentage of the celestial sphere do we see? This question arises from the notion that on average there passes one meteor per hour overhead. So ...
5
votes
2answers
57 views

Sillicon based life

My question may not be suitable here, because it's more of astrobiology. Life as we know, is carbon based. Is it possible life based on silicon? What will be the conditions for habitability for ...