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How to know if an exoplanet is terrestrial?

One way of trying to do this is to plot a surface gravity versus mass plot. It's basically difficult for gas giant planets to hang onto a gaseous envelope without having a high surface gravity. This ...
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Is it possible for a virus to come from a meteorite?

We’re talking about stochastics, so it’s impossible to say never. But we can tackle the question two ways: Big picture: tons of dust fall on the Earth from space every day. TONS, every day. You can ...

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