New evidence shows that, far beyond Pluto, there may exist a hypothetical planet referred to as Planet X or Planet Nine.

A new survey of 500,000 stars finds only 0.28% host close-in giants, showing how aging Sun-like stars drag their planets to destruction.

There are no confirmed exomoons, moons orbiting distant exoplanets in other solar systems. There are a few candidates, but ...

Comet 3I/ATLAS has gone from being an astronomic curiosity to the darling of the entire space science community. It is the ...

The National Aeronautics and Space Administration is, to put it bluntly, kind of a mess. This is not meant to disparage the ...

What is at the centre of the solar system? Apparently, it is not the Sun, but an invisible force that is pulling everything ...

Astronomers are gathering evidence of a massive hidden planet lurking beyond Neptune. These endangered predators have finally ...

Scientists who study comets are struggling to keep up with popular speculation that the interstellar object 3I/ATLAS was sent ...

Researchers analyzed nearly half a million nearby star systems to understand how giant planets fare as their stars expand ...

For years, scientists believed most mini-Neptunes were covered by vast oceans of molten rock—essentially entire planets made ...

Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a host star. But some are out there all ...

Using NASA's Transiting Exoplanet Survey Satellite (TESS), astronomers have discovered that aging stars in their so-called ...