Albert Einstein's theory of general relativity suggests backward time travel is possible in some scenarios, but do those situations ever exist in our universe?

As Cassini nears its death plunge into Saturn, scientists still have big questions they want to answer about the ringed giant.

The most intense fast radio bursts so far. / We keep detecting signals from the same place.

What seemed to be a new star blazed into existence on March 11, 1437. The galactic newcomer was witnessed by Korean royal astronomers, among the few people taking notes about the stars in the early 15th century.

Back in business!

They're calling it laser streaming. No, it's not a new sport or some Netflix-like pastime. Instead it's a new observable phenomenon involving fluids and laser beams.

A group of researchers at Columbia University's School of Engineering and Applied Science have successfully developed the first functional vascularised lung scaffold, and it could dramatically change how lung disease is treated.

It's a couple of million years early.

InSight will do a deep dive into the Martian underground, putting two instruments onto the surface that will ferry information back from the depths.

The long-tailed macaques of Thailand already used stone hammers to split open shellfish, and now they have worked out how to use them to crack open nuts

To anyone infatuated with science fiction, a Dyson sphere might be the Holy Grail. As physicist Freeman Dyson postulated and popularized more than half a century ago, an advanced, energy-hungry civilization might be driven to harvest as much power from their…

The 'missing link' we've been searching for.

Australian researchers have designed a new type of qubit - the building block of quantum computers - that they say will finally make it possible to manufacture a true, large-scale quantum computer.

 And you thought your indigestion was bad!

Intense light shows that break Earth-like physics.

For 13 years the spacecraft’s incredible, truly otherworldly images have revealed the wonder of Saturn in surprising, often awe-inspiring ways.

The Cassini spacecraft pulled off its final mission after 20 years in space, and collected data as it crashed into Saturn’s atmosphere. Read all about Cassini's "Grand Finale" and its Sept. 15 suicide plunge.

In less than 10 days, NASA’s heroic Cassini orbiter will make its suicidal dive into the surface of Saturn, bringing an end to a truly historic mission that has surpassed all expectations. He…

Dark energy, meet your match.