Add Yahoo as a preferred source to see more of our stories on Google. A stray comet from another star swings past Earth this week in one last hurrah before racing back toward interstellar space.

NASA released close-up images on Wednesday of the rare interstellar comet that's making a single pass through the solar system. One of the images shows the comet, also known as 3I/ATLAS, as it moves ...

Interstellar travel could be possible, scientists say, but not in the way you might think. For decades, science fiction stories have proposed the idea of traveling outside of our known galaxy. This ...