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, ...

But the surprises just keep coming. The mysterious entity, which was first spotted hurtling towards the Sun from far beyond in early July, has fascinated researchers ever since. As Science Alert ...

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 ...