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

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

What we know about the search for ‘Planet Nine’ in our solar system - The idea of a massive undiscovered planet has been around since before the discovery of Pluto in the 1930s ...

NASA scientists have discovered an electric field encompassing Earth’s atmosphere that is as "fundamental" as gravity -- and could even give clues about possible life on other planets.

Decades ago, a renegade physicist suggested that gravity isn't so much a force as just a byproduct of the universe's tendency ...

"For the first time, we have identified the earliest moment when planet formation is initiated around a star other than our ...

Small but rowdy space rocks pushing and jostling one another may have created the unusual orbits some astronomers cite as the signature of the hypothesized "Planet Nine," a new study suggests.

Our solar system officially houses eight planets, but some scientists say there could be a ninth. And that’s not just Pluto aficionados – evidence suggests a huge undiscovered world lurks on ...

Stars and planets are naturally associated with one another. While some planets have gone rogue and are drifting through ...

A massive doomed exoplanet on a death spiral toward its parent star has three possible catastrophic fates. A massive planet ...

Self-gravity – the gravitational force that holds sufficiently massive objects together – allows gas planets to maintain their form in the vacuum of space. Multiple lines of evidence show gas ...

NASA scientists have discovered an electric field encompassing Earth’s atmosphere that is as “fundamental” as gravity — and could even give clues about possible life on other planets. A ...