So in some sense, alien worlds were not first discovered in the 1990s or even the 1980s. It took nearly a century to fully ...

A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

The data, however, suggests there may be a subtle, regular change in the X-ray signal every 2.9 hours, providing evidence for the remains of a planet exceptionally close to the white dwarf.

This is particularly puzzling, as a vast majority of meteorites can be traced to some well-known parent body—whether that be ...

Everyone's favorite dwarf planet, Pluto, was discovered just 95 years ago. Here's the story of how the once-ninth planet was ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

Future missions to Venus could also supply additional data on the density and temperature of the planet's crust, which could ...

The findings provide strong evidence that four giant exoplanets 130 light-years from Earth formed much like Jupiter and ...

The planets are all too hot for life as we know it, but astronomers haven’t given up searching for more planets in Barnard's ...

Researchers have discovered four Earth-like rocky planets orbiting Barnard’s Star using advanced telescopes. These planets ...

Learn what planet rains molten iron and which planet has two moons like Tatooine in Star Wars.