A 7.0 earthquake off the coast of Northern California in early December triggered a tsunami warning for parts of the California and Oregon coasts.

Several factors help determine whether a given earthquake will generate a dangerous tsunami, but the process is not yet fully understood.

The Atlantic journalist Franklin Foer explains how SpaceX and the Trump administration are changing the face of NASA, and why Musk's dream of Mars may come at the cost of the agency's mission.

Extreme weather makes being out in nature more risky as the flood deaths at Camp Mystic in Texas showed.

A new study from Oxford University finds that a common European songbird sometimes divorces its partner between breeding seasons.

The gunman accused of killing four people in New York City suspected he had chronic traumatic encephalopathy, or CTE — a degenerative brain disease often associated with football players.

The Trump administration proposes eliminating a 2009 finding that greenhouse gases endanger people. That would undermine the EPA's climate change regulations for power plants and cars.

Two meteor showers — the Southern Delta Aquariids and the Alpha Capricornids —peak Tuesday night, giving stargazers a chance to see 20 to 30 meteors per hour.

It's one of the largest in the world and is meant to help replenish reefs that have suffered from bleaching.

The proposal would overturn endangerment finding, which determined that greenhouse gas emissions can be regulated under the Clean Air Act.