The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?
Definition of a moon in an exam: "A satellite of a planet that *doesn't produce light itself but reflects it*" - is there relevance for the emphasis?
Is it at all possible for the sun to revolve around as many barycenters as we have planets in our solar system?
The newly discovered comet NEOWISE has been given the name C/2020 F3. What is the meaning of the F3 and the C in this name?
If suddenly "knocked" or perturbed from its orbit, would gravity eventually return the Earth to its original orbit?
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