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 ...

(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 ...

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 ...

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...

Ultra-short-period planets are small, compact worlds that whip around their stars at close range, completing an orbit — and a single, scorching year — in less than 24 hours. How these planets came to ...

Water is essential for life on Earth and other planets, and scientists have found ample evidence of water in Mars’ early history. But Mars has no liquid water on its surface today. New research from ...

Mars could have lost its liquid water, the key ingredient of life, because it is small, according to a study. Washington University researchers say that the Red Planet's size may be the key reason it ...

Sept. 20 (UPI) --For a planet to be habitable, it must be able to hold significant amounts of liquid water. When considering a planet's potential habitability, scientists mostly look at a planet's ...

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 ...