Watch 2 NASA astronauts aboard the International Space Station (ISS) make history by performing the 1st ever all-female spacewalk on Friday.

New research suggests that the tiny human species - that survived until about 18,000 years ago, later than any human species other than our own - evolved its small size remarkably quickly while living on an isolated island.

Research involving a non-invasive scan of living human embryos shows that some muscles, thought to have been abandoned by our mammalian ancestors 250 million years ago, are still present before birth. They're among the oldest, albeit fleeting, remnants of evolution yet seen in humans.

Our global human population was estimated to reach 6 billion on today's date in 1999. Eleven years later, in 2011, Earth had gained another billion people. Today - October 12, 2019 - it stands at about 7.7 billion, according to United Nations estimates.

International Observe the Moon Night is a worldwide celebration of lunar science and exploration, celestial observation, and our cultural and personal connections to the moon. In 2019, it comes on October 5. Here's how to join in.

In October 2019, the research icebreaker Polarstern will drop anchor at an ice floe in the northern Laptev Sea, to spend a year investigating Earth’s Arctic.

Air temperatures in the Arctic are increasing at least twice as fast as the global average due to climate change. What worries climate scientists about this?

The first known interstellar visitor received the official name 'Oumuamua, meaning 'scout.' This one has a less romantic name and one that sets a standard for future discoveries: 2I/Borisov.

Thanks to 2019's record drought in Europe, a 7,000-year-old circle of 150 upright stones is back on dry land in western Spain, after 50 years underwater.

You can think of the equinox not as a whole day, but as a point along Earth's orbit. Want to understand that better? Guy Ottewell offers some insights.