Comet 3I/ATLAS will get closest to Earth on Dec. 19, and astronomers will be watching.

A new explanation for the solar system's radioactive elements suggests Earth-like planets might be found orbiting up to 50 ...

Rocky planets like our Earth may be far more common than previously thought, according to new research published in the ...

Hot Jupiters were once cosmic oddities, but unraveling how they moved so close to their stars has remained a stubborn mystery ...

Scientists have long believed that the Moon was formed by a massive object crashing into the Earth. But what was that thing ...

Bennu samples reveal biological sugars, a strange, gum-like material, and ancient stardust that shed light on the early solar ...

In a discovery that's fit for a movie, Northwestern University astronomers have directly imaged a Tatooine-like exoplanet, orbiting two suns. While obtaining an image of a planet beyond our solar ...

Even the best telescopes can’t see exoplanets. It’s all about watching for jiggly stars, blue shifts, and transits.

In the spirit of the season, the interstellar comet 3I/ATLAS is changing color as it leaves the sun behind — shifting from a ...

Interstellar comet 3I/ATLAS, a visitor older than the Sun, has stunned scientists with a colossal, puzzling X-ray cloud ...

In the rugged goldfields of southeastern Australia, a local prospector spent years trying to crack open a mysterious, ...