On July 1, scientists operating a planetary defense facility saw something glimmering in the shadow of Jupiter, about 420 million miles from Earth. It certainly wasn’t a near-Earth asteroid, nor was it a regular comet. Within a matter of hours, it became clear that this voyager wasn’t even from our solar system: Its orbit was too steep, its speed was too great. Astronomers quickly concluded that this was an interstellar object—a sojourner from another star.

These entities are, for the moment, vanishingly rare. This interstellar object is just the third ever confirmed. Serendipitously, scientists caught as it was making its way into the solar system, which means they will get to study it for several months and uncover its many secrets.

“Astronomers around the world will be pointing their telescopes, large and small, at this object… providing us with clues about its home planetary system,” says Sarah Greenstreet, an astronomer at the University of Washington.