Late-stage planetary collisions reshaped Earth and its neighboring planets, delivering water, altering their atmospheres, and influencing their tectonics. New findings suggest these violent impacts ...

WASP-121b is unlike anything in our Solar System. This giant planet orbits its star so closely that it completes a full orbit in just 30.5 hours. Its dayside reaches a scorching 3000°C, while the ...

In A Nutshell Arrokoth, a snowman-shaped object billions of miles from Earth, is one of the oldest and least-disturbed relics of the early solar system Scientists have long debated whether its two ...

As humans, we’re curious about how we got here. When we look out at the night sky, we see stars and planets, even galaxies. The glorious sight makes us wonder where it all came from — how the universe ...

Grab-and-go missions to asteroids have provided some of the most scientifically valuable samples since the Apollo missions—and they’re shaking up the search for life beyond Earth. The OSIRIS-REx ...

Within the past two decades, scientists have found more than 300 planets around stars beyond the sun -- most of them giant gas or ice planets, some of them possibly rocky giants, or "super-Earths." ...

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...