It's no secret that Earth is doomed. Sure, there's the threat of climate change and the fact that sea levels are rising ...

As astronomers study an exoplanet called K2-18b, conflicting research reveals how difficult it is to find evidence of life ...

These majestic landscapes have always been dangerous, but as the world warms, mountains are becoming much more unpredictable ...

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.

Astronomers have spotted a cosmic mismatch that has left them perplexed - a really big planet orbiting a really small star.