Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

Astronomers are tracking a newly spotted comet, named 3I/ATLAS, hailing from parts unknown. It is only the third time such an ...

The Solar System, home to Earth and countless other fascinating planets and moons, exists within the Milky Way galaxy. But ...

There’s a visitor in town, and its name is 3I/ATLAS. The presumed interstellar comet presents a rare opportunity for ...

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

"This is a big step in understanding the outer solar system," team leader Rosemary Pike from the Center for Astrophysics | ...

Astronomers have discovered the earliest seeds of planets forming around HOPS-315, a baby star located 1,300 light-years away ...

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...