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

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, ...

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

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

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

Mercury is the closest planet to the sun, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury orbits ...

No matter how many missions to Mars she takes part in, the sheer joy of unearthing discoveries about the red planet never ...

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

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

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

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

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...