/r/askscience
Hypothetically speaking would the earth be able to last forever as we know it? ie. Hot core, liquid water etc. Assuming all external conditions were perfect such as no meteor collisions, no imminent supernova of the sun, no continuous universal expansion causing the earth to freeze etc.
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[Astronomy] Do we know enough about the heavy metal output of supernovae to speculate as to what the mass of the first generation of stars was? What do we know about the first stars?
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Sexually monogamous-type breeding strategies are not-uncommon in a number of species. Are there any non-human species where infidelity results in conflict between the breeding pair?
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Hypothetically, is it possible to have a nuclear powered aircraft (what about a passenger jet)? Has such a thing been attempted?
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Do radioactive elements decay at the same rate if said elements are traveling near the speed of light?
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If a virus is not alive, where does it come from? Are all viruses ancient? So mutated from their origin point they diverge into different viruses entirely?
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