The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Understanding where Earth's essential elements came from—and why some are missing—has long puzzled scientists. Now, a new ...

The OSIRIS-REx mission returned to the sample to Earth in September of 2023, and these studies show that it contains amino ...

Astronomers discovered the gas giant planet — dubbed a "hot Jupiter " — in 2016, but have continued to investigate this ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

Mercury takes only 88 Earth days to orbit the sun.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

Samples from asteroid Bennu have delivered insights into the origins of Earth’s water and the organic molecules that may have ...

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...