Earth objects, astronomers recently discovered a comet visiting from interstellar space. This is only the third interstellar object ever discovered, following ‘Oumuamua and Comet 2I/Borisov. Each of these interstellar visitors offers a chance to learn about another star system without having to go there ourselves,

I/ATLAS isn't just fascinating because it is the third interstellar visitor found in the solar system; new research suggests it's also the oldest comet ever seen, at over 7 billion years old.