Tumbling through Earth’s increasingly crowded orbit are about 5,000 satellites, half a million pieces of human-made debris and only one confirmed natural object: the moon. Now, astronomers working out of the University of Arizona’s Steward Observatory think they may have discovered a second natural satellite — or at least a temporary one.

Meet 2020 CD3, Earth’s newest possible “minimoon.”

BIG NEWS (thread 1/3). Earth has a new temporarily captured object/Possible mini-moon called 2020 CD3. On the night of Feb. 15, my Catalina Sky Survey teammate Teddy Pruyne and I found a 20th magnitude object. Here are the discovery images. pic.twitter.com/zLkXyGAkZl

— Kacper Wierzchos (@WierzchosKacper) February 26, 2020

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The mysterious radio signal from a planet beyond the Solar System: What exactly did scientists detect?

A minimoon, also known as a temporarily captured object, is a space rock that gets caught in Earth’s orbit for several months or years before shooting off into the distant solar system again (or burning up in our planet’s atmosphere).

Read more: Space