I/ATLAS might be over 7 billion years old, a new study reports, which would make it the oldest comet known. But experts caution we need more data.

NASA’s Voyager 1 and Voyager 2 spacecraft delivered groundbreaking data that expanded our understanding of the solar system’s outermost edge,a region scientists call the "cosmic coastline." This is ...

Astronomers have spotted a new interstellar object — the third of its kind ever seen — shooting towards us through the solar ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

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Astronomers tracking an interstellar object flying through the solar system think it comes from a star at least 8 billion ...

NASA’s Voyager 2 became the first and still only spacecraft to fly by Uranus, offering humanity its first close-up look at this mysterious, icy giant. Orbiting over 1.8 billion miles from Earth, ...