Billionaire entrepreneur Elon Musk on Tuesday reshared images of the first views of Earth's polar regions captured by ...

We often focus on space observatories that peer beyond Earth. But the vast majority of satellites stare right back at us.

Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing ...

The moon slipped between the Earth and the sun on Saturday, casting a shadow on our planet in parts of the United States, ...