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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Venus is often called Earth's evil twin due to its size, mass, material composition, and density. It even feels like Venus should've become a second Earth. However, it ended up being one of the ...

‘Small’ asteroids the size of buses or stadiums have been pinpointed between Mars and Jupiter for the first time. Scientists used a new method of tracking the space rocks, which could one day save us ...

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A satellite orbiting Mars has captured the best-ever images of a gigantic "scar" carved across the Red Planet's surface. The dark ravine, which is accompanied by unusual zebra-like stripes, is likely ...

(CNN) — Hundreds of basketball-size space rocks slam into Mars each year, leaving behind impact craters and causing rumblings across the red planet, according to new research. Mission planners could ...