Questions tagged [astronomy]

Questions that intersects astronomy with Earth Sciences. For pure astronomy please refer to the Astronomy Stack Exchange.

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Did Theia collide directly with proto-Earth?

I was learning about the formation of Earth on Kahn Academy where it was mentioned that a protoplanet named Theia had a glancing impact with the earth and formed the moon. It seems like there is also ...
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What would be characteristic time of the escape of an 1atm air (or oxygene atmosphere) from the Moon?

(related question) I am thinking on the Moon if it would have an oxygen atmosphere. What would be the characteristic time of its escape? Although the Moon has a much lower escape velocity as the ...
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Identifying circle of light in night sky

I was recently reminded of when, while with some friends 20some years ago, we happened to look up and see a circle of what seemed to be light (in the sky of course). The circle was "empty" (only the ...