Two U.S. astronauts aboard the International Space Station began a spacewalk Thursday to make repairs and install new equipment.

Americans Jeff Williams, 58, and Kate Rubins, 37, emerged from the ISS at 1153 GMT for a mission expected to last about six and a half hours.

Life on Earth is even older than we thought, Australian scientists said Thursday as they unveiled fossils dating back a staggering 3.7 billion years.

Lucy, an ancient ape-like human relative, met a brutal end when she plummeted from a tall tree, new analysis of the famous fossil suggested Monday -- offering a solution to a decades-old mystery.

The six people who went into isolation for a year in Hawaii to help NASA plan for a mission to Mars emerged Sunday, happy to breathe fresh air and meet new people.

The team was based on a barren, northern slope of Mauna Loa, living inside a dome that is 36 feet (11 meters) in diameter and 20 feet tall.

The idea for a device that could unveil the origins of life in our solar system began with a Solo cup.

Next month, an invention inspired by that plastic, disposable beverage cup will launch into space aboard the United States' first robotic mission aimed at scooping up 4.5 billion-year-old dust from an asteroid.

With more private spaceship traffic expected at the International Space Station in the coming years, two U.S. astronauts embarked on a spacewalk Friday to install a special parking spot for them.

The spacewalk began at 8:04 (1204 GMT) when Americans Jeff Williams and Kate Rubins switched their spacesuits to internal battery power.

China launched the world's first quantum satellite Tuesday, state media reported, in an effort to harness the power of particle physics to build an unbreakable system of encrypted communications.

A recent anthrax outbreak in the far north of Russia left a child dead, 23 people infected and the government scrambling to deploy hundreds of rescue workers and soldiers to stop any further spread.

Noise from ships impedes humpback whales from foraging for food, and could have long-term impacts on the health of these majestic creatures, according to a study released Wednesday.

A coalition of U.S. groups representing more than 10 million scientists and engineers published 20 questions on Wednesday they want every U.S. presidential candidate to answer ahead of November's vote.

The questions range from how to support vaccine science, to defining the scope of America's goals in space, to the candidates' views on climate change and what would they would do about it.