EARTH

The last mass extinction wiped out non-avian dinosaurs 66 million years ago.

Fungus communities grew and became more diverse during a simulation of an astronaut crew living in a space habitat. So how will we keep our space travelers safe from infection?

Scientists and policymakers reveal six milestones that can save the world from climate change catastrophes.

NASA scientists want to use static electricity to clear dust from the air on Mars so astronauts can make a good life there.

The megalodon was the biggest shark ever — by a lot — but it went extinct a couple million years ago. It turns out it could have died out with many more ocean animals, in a global extinction event.

Just because an asteroid passes by Earth from a safe distance one year doesn’t mean it will always happen that way.

What does Betelgeuse look like? Astronomers got the most detailed image ever of the star in the constellation Orion, and it could teach us about the evolution of stars and planets.

Dutch scientists say a meteorite that crashed near Amsterdam this year is about as old as the Earth, so it can tell us how our solar system and our planet formed.

Planet 10? Pluto had its planetary rank ripped away from it, but there could be two more planets out there waiting to take its place.

A spaceship riding on a light beam could be the next Mayflower, says Stephen Hawking, carrying us to human colonies on other planets faster than rockets can.

Professor Alan Fitzsimmons said a dangerous asteroid could hit Earth at any moment and destroy a city.

NASA and other space authorities have launched some bizarre things into space in the last few decades, everything from a Buzz Lightyear figurine to a drawing of a penis.

Physicist and doomsayer Stephen Hawking has provided a gentle reminder (predictions) that he thinks we’re all going to die if we stay on Earth.

An eighth pass at data from NASA's Kepler Mission revealed more potentially habitable exoplanets.

Solar and lunar eclipses are visually stunning, but they also teach us a lot about the solar system and the universe.

Scientists drew a map of ocean temperatures through the ice age and compared it carbon dioxide levels to find out how the ocean evolves as the climate changes.

Privately owned Moon Express is planning to bring back a scoop of lunar soil — and sell it for profit.

As Mars was changing from a comfortable planet with a thick atmosphere and lots of water into a dry and cold wasteland, these rocks captured evidence of those environmental changes.

That's in addition to another 96 newly discovered space rocks and an unexplained increase in comet activity.

The Cassini spacecraft has sent back a ton of images and data to NASA and Earth during its time in the outer solar system. Here’s a look back at some of the most amazing photos.

If humans start a Mars colony and live there for generations, will their descendants ever be able to visit Earth? Not if they eat too many insects along the way.