Learn how Pluto nearly kept its planet status in a proposed 12-planet Solar System as its demotion marks its 20th anniversary ...

A 24-year-old observatory assistant from the Midwest discovered Pluto. Clyde Tombaugh, born in 1906 in Streator, Illinois, ...

Those who supported Pluto’s demotion included Neil DeGrasse Tyson ...

Pluto lost its planethood for a very specific reason. Whether or not that’s a good reason depends on who you ask.

Jupiter is the largest planet in the Solar System, a massive gas giant so enormous that its gravitational influence reaches ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

Twenty years after Pluto became a dwarf planet, people are still fighting over its status. Experts explain why the debate ...

Picture a star, about half the sun’s mass shining with a dim red light. Lumbering around it on a 5,000-year orbit is a huge ...

The Sun is an incandescent but benevolent dictator. For billions of years, it’s kept our star system well organized through the influence of its powerful gravity. All the planets revolve around it on ...

Found in the northern sky, GJ 3378b is a potentially rocky world with liquid water on its surface, receiving 90% of the ...

Nasa's powerful James Webb Space Telescope is showing us something humankind has never witnessed firsthand before: The birth ...

Because the planets in our solar system are so bright, they flood the telescope's sensors with more light than they can ...