Astronomer Eliza Kempton said that she had waited her "entire career" to peer into an atmosphere from this mysterious class of planets.

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

This range aligns with theoretical predictions for Planet Nine’s distance and mass, estimated between 7 and 17 times that of Earth . The researchers initially identified 13 candidate pairs showing the ...

A team of international scientists has identified a promising Planet Nine candidate by comparing infrared surveys of the sky ...

A 9th planet in our solar system might be found — and no, it’s not Pluto - Is there another planet out there? Researchers say ...

The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. In 1983 ...

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

May 5 is National Day of Awareness for Missing and Murdered Indigenous Persons (MMIP), a reminder of the violence that ...

For over a century, astronomers have wondered if there's an extra planet in our Solar System that we haven't been able to see ...