New evidence shows that, far beyond Pluto, there may exist a hypothetical planet referred to as Planet X or Planet Nine.

Scientists have discovered the strongest evidence yet of a rocky planet with an atmosphere outside the solar system, challenging previous notions that small planets that orbit closely to their stars ...

The interstellar comet 3I/ATLAS reaches its closest point to Earth on Dec. 19, allowing close study with no threat to the ...

A rocky exoplanet outside the Earth's solar system may have an atmosphere, according to new evidence gathered by NASA ...

A mysterious interstellar comet known as 3I/ATLAS is about to make its closest approach to Earth in December 2025. Here's ...

Scientists may have discovered an atmosphere on a distant planet. Astronomers at NASA used the James Webb Space Telescope to detect evidence suggesting that the rocky planet called TOI-561 b, aka ...

A study of the interstellar comet 3I/ATLAS reveals surprising characteristics: traveling at 57 km/s, it challenges ...

Learn what the first maps of the sun's atmospheric boundary reveal about solar wind and its escape into space.

Fresh simulations show there is a chance Uranus and Neptune might actually be rock-rich worlds wrapped in thinner icy layers.

The cometary cameraman was not the only one to snap the celestial snowball of late. On November 30, NASA’s Hubble Space Telescope captured a deeper look at interstellar comet 3I/ATLAS, with its Wide ...

As polar sea ice continues to shrink, small-scale churning and mixing in the Arctic Ocean are becoming stronger.

James Webb finds a hot planet that is tidally locked with its parent star, is coated with a thick atmosphere of volatile ...