The search for an unknown planet in our solar ... system planet, which they dubbed Planet Nine. Planet Nine is believed to be between five and 10 times the mass of Earth and would be orbiting the sun ...

In a universe where change usually unfolds over eons, astronomers have gotten a rare front-row seat to watch a small, icy ...

Material around Chiron, a small icy world in the far reaches of the solar system, may be taking shape into a ring system of ...

There may be more than meets the eye with The Kuiper Belt, a ring comprising thousands of large, icy objects and dwarf planets that encircle our solar system. A yet-to-be-published study, spotlighted ...

You might think we know the solar system pretty well, but there's a lot more to our cosmic neighborhood than initially meets the eye (or telescope). Most of the good stuff, such as the planets, moons ...

The current understanding of the Kuiper Belt is that it extends from the orbit of Neptune at 30 astronomical units and is 50 astronomical units away from the Sun. One astronomical unit (AU) is the ...

The European Space Agency (ESA) shared more data on the 3I/ATLAS interstellar comet after pointing to Mars orbiters at it.

Asteroid 2025 TP5, discovered just two days before its approach, will fly past Earth on October 15 at a dangerously close ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Astronomers have ...

New telescopes will give breathtaking insight into what, or who, is visiting Earth's neighborhood. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works ...