An interstellar asteroid might have just been spotted for the first time

The interloper could carry information about the makeup of alien planet systems

A/2017 U1's trajectory

INTERSTELLAR INTERLOPER?  The unusual trajectory of an asteroid, called A/2017 U1, suggests it came from outside the solar system and is now on its way out again.

JPL-Caltech/NASA

This article is only available to Science News subscribers.

Subscribers, enter your e-mail address to access our archives.

Not a subscriber?

Science News is a nonprofit.

Support us by subscribing now.

More Stories from Science News on Astronomy

From the Nature Index

Paid Content