Which way is ‘down’ has a different answer depending on where you are on Earth, in the solar system, in our galaxy and beyond ...

Astronomers are once again questioning whether our solar system is complete. Subtle gravitational effects suggest something ...

Earth is the only life-supporting planet in our Solar System. Until now. Today, we’re bringing Kepler 22-b into our planetary ...

Spectacular clouds swirl across the surface of Jupiter. These clouds contain water, just like Earth's, but are much denser on ...

We live in a very exciting time: answers to some of the oldest questions humanity has conceived are within our grasp. One of ...

A solar conjunction occurs as Venus' orbit carries it into alignment with the sun and Earth. Venus will align with the sun ...

The star system V1298 Tau reveals that many planets begin as large, low-density worlds that slowly shrink and shed their ...

A “natural history” approach to space exploration would take into account instead developments in the fields of physics, ...

Currently, the Moon is drifting away from Earth at a rate of about 1.6 inches per year making it slowly appear smaller in the ...

Curious Kids is a series for children of all ages. If you have a question you'd like an expert to answer, send it to ...

On Saturday (Jan. 10), for example, we will see three satellites on one side of Jupiter (going outward from the planet: Ganymede, Io and Europa ), while the fourth ( Callisto) remains all by itself on ...

Every sign brings something to the celestial table. Here's what you should know about the zodiac signs, including strengths, ...