The head of planetary defense at the European Space Agency discusses 2024 YR4, an asteroid with a small chance of striking Earth eight years from now.

Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

Around 20 million people across the United ... and the protection of forests. In honor of Earth Day, the Giraffe Blog has put together 50 awesome facts about space, the atmosphere, the sea ...

Elephants are the largest land animals on Earth, and they're also one of the ... Herds have about six to 20 members, and Asian elephants form smaller herds than African elephants do.

Brr! But in sunlight near Earth, temperatures can swing to a boiling 250 degrees Fahrenheit. That's why astronauts wear reflective white spacesuits. Unimpeded, light can move at 299,792,458 meters ...

On 31 March 2007, more than 2.2 million individuals and 2,000 businesses in Sydney, Australia switched off their lights for one hour, which marked the beginning of the Earth Hour movement. And that ...