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

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

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

Among the most prevalent stars in our galaxy are red dwarfs, M-dwarf stars that are smaller and cooler than our Sun. The majority of them possess at least one rocky planet of comparable size ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't ...

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

Shining in the constellation Gemini near the bright stars Pollux and Castor, Jupiter's opposition is the best time to see the ...

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 ...

What was originally thought to be a planet orbiting the Fomalhaut star was probably just the fallout of a wild collision.

Andreas Malm and Thea Riofrancos joined The Nation’s Wen Stephenson in an urgent conversation about the left and the climate ...

Gaia data reveals signs of planets forming around young stars by measuring stellar motion, identifying planetary, brown dwarf, and stellar companions in early star systems ...

A rare triple conjunction of Venus, Mars and Mercury is happening on the opposite side of the solar system to where Earth is, ...