In a new study featured by New Scientist, researchers propose that Mars might have once had a much larger moon than it does ...

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 ...

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 ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Lee said he and ...

(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 ...

The long-chain organic molecules decane, undecane, and dodecane. These are the largest organic molecules discovered on Mars to date. They were detected in a drilled rock sample called "Cumberland" ...