Astronomers have spotted a mysterious cosmic object that could be the lightest black hole or the heaviest neutron star ever discovered — or something completely new to science. The unknown object, ...

I/ATLAS has passed its closest point to Earth, meaning we will soon lose sight of it for good. Some scientists want to send a spacecraft to chase down the alien comet — or the next interstellar object ...

Interstellar object 3I/ATLAS has surprised scientists by showing no cometary tail after passing close to the Sun. This unexpected behavior challenges the assumption that it's a typical comet, fueling ...

The scientific community is embroiled in a heated debate over the origin of a mysterious interstellar object that entered our solar system last month. While NASA initially identified the object, named ...

The 3I/ATLAS interstellar object, detected by NASA, is remarkably larger and more massive than earlier estimates, making it an exceptionally rare visitor. Its unusual trajectory and characteristics, ...

How frequently does a traveler from another star system sweep through our galactic neighborhood, and astronomers rush to the telescope? Not until recently was the answer: hardly ever. In fewer than ...

A prominent Harvard astrophysicist has claimed that a mysterious object moving through our solar system could be a nuclear-powered spacecraft. Professor Avi Loeb, director of the Galileo Project, ...

In the last few decades, physicists have found ways to super-cool objects so that their atoms are at a near standstill, wrestling small objects such as clouds of millions of atoms, or nanogram-scale ...

If you are a scientist looking to indulge in a bit of speculation, or if you are a journalist looking for a sensational claim to attribute to a scientist, your best bet would be to set your sights on ...

A team mapping radio waves in the universe has discovered something unusual that releases a giant burst of energy three times an hour, and it's unlike anything astronomers have seen before. Spinning ...