Determining the size of an Earth-size exoplanet by the amount of starlight it blocks hundreds of light-years away once was the realm of science fiction. Measuring the mass of such a small planet based ...
NASA's Perseverance rover captured this pre-dawn view of Mars' moon Deimos hanging over a dimly-lit Martian vista. Unlike Earth's moon, which is roughly one-fourth the planet's size, Deimos is less ...
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