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Astronomy

Mercury's spin-orbit resonance

When was it confirmed that Mercury has a 3:2 spin-orbit resonance and by whom (research group/radio observations… )? The first suggestion was made by Giuseppe Colombo in 1965. Its proximity to the…
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Astronomy

What exactly is a “moon”?

Recently some new moons of Jupiter were discovered. However the moons are pretty damn small indeed - only a few kilometers wide. That makes me wonder if they should even be called moons in the first
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