Harvard physicist Avi Loeb revealed that the object is expected to pass by Earth on December 17, speeding through the solar system at more than 41 miles per second (roughly 150,000 miles per hour).
That means the unidentified object, which scientists are calling A11pl3Z, is moving too fast for it to get caught in the gravitational pull of our sun or any other planet.
A11pl3Z’s unusual course and speed were first spotted by astronomer Sam Deen in late June, however, it has just been flagged by the International Astronomical Union after its interstellar origins were confirmed.
Loeb believes A11pl3Z could be a large space rock or a comet, but astronomers are still figuring that out.
It’s estimated to be about 12 miles wide. That makes it much larger than the last two otherworldly objects that flew through our solar system, Oumuamua and the comet Borisov.
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