If the definition is approved by the astronomers gathered 14-25 August 2006 at the IAU General Assembly in Prague, our Solar System will include 12 planets, with more to come.

The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many ...

Now, a group of scientists says Pluto should definitely be added back to the planet list — oh, and that there are over 100 other objects in our solar system that should also be called planets.

Searching for meaning in distant solar systems Is it better for a science writer to be technically correct or understood?

Called 3I/ATLAS, the object is only the third of its kind known to astronomers, and it’s likely been heading our way for billions of years, carrying pristine material from another star system ...

The odd nature of 3I/ATLAS led astrophysicist Avi Loeb to apply a thought experiment to it, highlighting everything that might align with an alien spacecraft.

In Liu Cixin's short story "The Wandering Earth (opens in new tab)" (first published in Chinese magazine Science Fiction World in July 2000), Cixin portrays a scenario in which the planet's leaders ...

Earth is the sixth planet from the edge of the solar system, meaning we're none too near this cold and inhospitable frontier. But we've sent out various spacecraft over the years, so do we have ...

Astronomy Solar System 7 planets are aligned in the night sky right now. But what's that mean for science?