An object inside our galaxy is moving so fast that it is on track to break free of the Milky Way altogether, racing through ...

A world preparing for one interstellar mystery is now confronting the legacy of another mission built for a different kind of threat. A silent shift in our planetary-defense strategy is underway.

Astronomers have calculated the risk posed by interstellar visitors such as 'Oumuamua and 3I/ATLAS hitting the Earth. They conclude that, unlikely as such an event is within anyone’s lifetime, it’s ...

Potential impactors are most likely to have low velocities and the highest likelihood of hitting Earth during the winter.

Researchers have described a new, lower size limit for planets to maintain surface liquid water for long periods of time, extending the so-called Habitable or 'Goldilocks'' Zone for small, low-gravity ...

Far beyond Neptune, at the far outer rim of our Solar System, astronomers have spotted what looks like a hidden “structure” ...

Even teeny objects obey the law of gravity. A gold ball just 2 millimeters wide, with a mass of about 90 milligrams, is now the smallest object to have its gravitational pull measured. Observations of ...

Flat Earth theory, the erroneous idea that the Earth is flat, continues to persist online despite overwhelming evidence to the contrary. Some proponents of this model believe that the Earth cannot be ...

Mission engineers will track NASA's Lucy spacecraft nonstop as it prepares to swoop near Earth on Oct. 16 to use this planet's gravity to set itself on a course toward the Jupiter Trojan asteroids.