What if there’s a planet hiding in our solar system, 10 times larger than Earth? While this theory has yet to be confirmed, ...

Planet Nine – which scientists think might be 10 times Earth’s mass – could be lurking out past Pluto’s orbit. But Planet Nine might not be all we’ve missed in our solar system .

Explore the wonders of the universe in this video as we delve into the question: How many planets exist in the universe? Gain ...

Ten new planets outside our solar system that are likely the right size and temperature to potentially support life on them have been found by NASA’s planet-hunting telescope. The 10 planets are ...

Ammonite was discovered using the Subaru Telescope in Hawaii, with follow-up confirmation from the Canada-France-Hawaii ...

According to the paper laying out the research behind the discovery, "TOI-1846b is a super-Earth-sized planet, with a radius ...

Planet Nine: A planet search at solar system's edge The hypothesized Planet Nine is estimated to be about 10 times the mass of Earth (Image credit: ESO/Tom Ruen/nagualdesign) ...

When it comes to real planets—bodies with enough mass to achieve a nearly round shape, clear nearby debris, and orbit the sun—we know of only eight in our solar system.

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's not aliens.) ...

Answer 17: A meteoroid is a small rocky or metallic body in space. A meteor is the streak of light produced when a meteoroid ...

Move over, Planet 9. There's a new possible planet lurking out in the solar system and it could be messing with a whole lot of distant space rocks. Freelance writer Amanda C. Kooser covers gadgets ...

Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky.