The highly anticipated moment for skywatchers is finally approaching as interstellar comet 3I/ATLAS prepares for its closest pass by Earth this December. The mysterious object famous for both ...

An interstellar visitor to our Solar System, designated comet 3I/ATLAS, has surprised astronomers by first appearing to confirm Albert Einstein’s 1915 theory of general relativity, but then deviating ...

Add Yahoo as a preferred source to see more of our stories on Google. NASA released close-up images on Wednesday of the rare interstellar comet that's making a single pass through the solar system.

A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar system by more than 3 billion years, researchers say. The "water ice-rich" ...

The sun warms the Earth, making it habitable for people and animals. But that's not all it does, and it affects a much larger area of space. The heliosphere, the area of space influenced by the sun, ...