/u/sdonnervt's posts
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What's the closest start we can see from Earth that we would not be able to see the Sun from if we were at that star?
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When an atom undergoes alpha decay, what happens to the two extra electrons? Is the new daughter atom an ion, or do the electrons get ejected from the electron cloud as well?
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If I'm moving toward +x at 0.6c, and you're moving toward -x at 0.6c, how do I not exceed the speed of light from your reference frame?
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