Planet Earth

Earth's day used to be five hours shorter, and it's predicted to continue lengthening over time.

This stagnant brine pool at the bottom of the Gulf of Mexico is so toxic it kills and embalms any crabs and amphipods that are unlucky enough to stumble into it.

The Fen Carbonatite Complex may be Europe's key to a secure rare-earth-element supply chain following the discovery of a huge deposit at the site.

Rocks and minerals are closely related, but there are fundamental differences between the two.

The coldest city in the world is in Siberia, where temperatures plummet to minus 76 degrees Fahrenheit. Here's why it's so cold there.

This 2017 satellite photo shows an unusual cloud "cyclone" nestled up against the coastline of Spain and Portugal. Researchers are unsure what caused the strange structure's spin, but ocean eddies and an extreme heat wave likely played key roles.

The Cascadia subduction zone is more complex than researchers previously knew. The new finding could help scientists better understand the risk from future earthquakes.

Zombie fires that burn underground over winter may be a case of climate change-driven spontaneous combustion, new research reveals.

Iron-rich waters buried beneath Taylor Glacier in East Antarctica are sporadically released in what looks like a bloody mess — but the so-called Blood Falls aren't as gruesome as they first appear and sound.