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Dec
4
awarded  Yearling
Nov
13
answered Why is the Oort cloud presumed to be spherical?
Sep
24
awarded  Autobiographer
Apr
21
awarded  Supporter
Mar
17
comment Why are most planetary orbits nearly circular
I don't think we know what happened with Triton. The last theory I heard was that Triton was part of pair of bodies orbiting the Sun (kind of like Pluto and Charon), and that Triton was captured by Neptune with the other body thrown out.
Mar
16
answered Why are most planetary orbits nearly circular
Dec
9
comment How do scientists know there are about 300 billion stars in a galaxy and there are about 100 billion galaxies?
They have graduate students that count all of them.
Dec
6
awarded  Enlightened
Dec
6
awarded  Nice Answer
Dec
4
awarded  Editor
Dec
4
revised At what distance from Earth would our Sun be the same apparent magnitude as the next brightest star in the sky?
added 122 characters in body
Dec
4
awarded  Teacher
Dec
4
answered At what distance from Earth would our Sun be the same apparent magnitude as the next brightest star in the sky?