How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between ...

Neptune stands stationary against the background stars of Pisces the Fish at 11 A.M. EDT. The solar system's most distant ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

The Sun, our life-giving star, is slowly dying. In about 5 billion years, it will exhaust its fuel and transform into a red giant, altering the solar system forever. But long before that, the Sun’s ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

For only the third time in history, astronomers have detected a new interstellar visitor — an object from another star — blitzing into our solar system.