The solar system is 4.54 billion years old, based on rock dating. Gas giants (Jupiter and Saturn) likely formed first. Ice giants (Uranus and Neptune) probably formed next. Rocky planets formed last, ...

This story is part of Short Wave's series Space Camp about all the weird, wonderful things happening in the universe. Check out the rest of the series. If you were born in the last century you might ...

CLEVELAND — With so much focus on the total solar eclipse right now, I thought some stellar solar system facts would shake up your universe. Let me take you back to grade school and the solar system ...

In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet. It's called 2017 OF 201, a rock that appears to be some 700 ...

The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...

All of our solar system’s planets are lining up in the night sky at once this week. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known as a great ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. If you’re in the path of totality on April 8, you’ll see ...

In a groundbreaking discovery, astronomers have confirmed the approach of a “wandering planet” into our solar system. This celestial event has sparked a flurry of scientific interest and speculation.

Far beyond Neptune, at the far outer rim of our Solar System, astronomers have spotted what looks like a hidden “structure” or “band” of small worlds.

There are 8 planets in our solar system. The planets orbit the Sun in elliptical trajectories, and they are all different in size, composition, temperature, and characteristics. The planets can be ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Astronomers have found a distant celestial body — ...