/u/The_noseless_Ginge's posts in /r/askscience
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If the speed of light is ~3×10^8m/s and the universe is ~13.8 billion years old, how is it that the observable universe has a radius of ~46.5 billion light years if nothing can move faster than light?
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How can the 4s orbital require less energy than the 3d orbotal whilst being further away from the nucleus?
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