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How about, instead of looking for one signature from one uncommonly-captured phenomenon indicating one class of conjectured DM, they...
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Some of the "great filters" assume a *technological* civilization was able to rise up to start with.
A number of the emerging hurdles...
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The sun is to all appearances a relative calm and stable star when compared to the majority of similar stars. Red dwarfs in particular...
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The answer to the Fermi Paradox, rather than being a needle in a haystack, is turning into an embarrassment of riches:
Asteroid strike...