Researchers found the object named 2017 OF201 while searching for "Planet Nine" - a hypothetical planet thought to exist ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

James Webb Space Telescope observations suggest Pluto’s atmosphere is unlike any other in the solar system, confirming a 2017 ...

The discovery of the exoplanet, a super-Earth called Kepler-735c, is all down to something called transit timing variations, ...

It had not been thought possible that such tiny, weak stars could provide the conditions needed to form and host huge planets.

A sweeping new ICE operation shows how Donald Trump’s focus on immigration is reshaping federal law enforcement.

Scientists say a new planetarium show about the Milky Way has helped them unlock one of the solar system’s many secrets.

"Are we alone?" This ancient question has occupied humanity's mind for a long time. In 1995, the discovery of the first ...

The search for life beyond Earth is a key driver of modern astronomy and planetary science. The U.S. is building multiple ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

In a distant region of space thought to be empty, a newly discovered dwarf planet inspires a debate about the existence of a giant planet hiding out there.