/r/askscience
AskScience AMA Series: We are building the national quantum network. Ask Us Anything about the #QuantumBlueprint
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Normal stars are made out of hydrogen which undergoes fusion. Can I make a star out of any element, provided I have enough mass to fuse that element? Say, Iron?
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When measuring how high terrain is on the moon and Mars, what do they use for/how do they determine “sea level”?
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Given that the tectonic plates are (slowly but constantly) moving, what does it mean when geologists/palaeontologists say something happened in (for example) the region of England hundreds of millions of years ago?
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