A rocky planet nearly 50 light-years away appears to be airless, dark, and covered in volcanic or weathered rock, according ...

A rare observation opportunity revealed the presence of a thin atmosphere around a small object beyond Pluto.

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

Rather than slowly condensing over millions of years, the first building blocks of Earth and other planets may have formed rapidly in a chaotic disk at the dawn of the solar system The triumph of NASA ...

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...

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

It’s not every day you get a chance to spot multiple planets with the naked eye—but this month, you can. Venus and Mercury are both visible in the sky, offering a rare glimpse ...

The interstellar comet 3I/ATLAS was the third object ever discovered in our solar system that originated from another star system. Despite a viral conspiracy theory, NASA officials have repeatedly ...

While Galileo's observations killed off the old model, we would need to wait centuries for conclusive evidence that Earth ...

WEST LAFAYETTE, Ind. — The organic ingredients to life, hints to where Earth’s water came from, and the fundamental building blocks of our planet and the solar system seem like a lot to fit in 4 ...

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