/u/Celestor's posts in /r/askscience

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When you look up at the night sky at you see a single star, how many photons are entering your eye so that you can see that one star?

654 upvotes

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Why don't planetary space missions use our Moon as a gravitational slingshot to reduce required delta-v?

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Regarding the idea of panspermia, how exactly would fragments of an asteroid that hit the surface of the Earth be ejected out of the atmosphere and Earth's gravity?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
When you look up at the night sky at you see a single star, how many photons are entering your eye so that you can see that one star?	654
Why don't planetary space missions use our Moon as a gravitational slingshot to reduce required delta-v?	1
Regarding the idea of panspermia, how exactly would fragments of an asteroid that hit the surface of the Earth be ejected out of the atmosphere and Earth's gravity?	1