Recently, the online world has been abuzz with speculation that NASA has confirmed the discovery of a second moon in Earth's orbit.

Take any such rumors with a hefty grain of salt.

Earth still only has one true natural satellite – our 2,159-mile-wide moon located about 239,000 miles away. However, astronomers have discovered a number of celestial objects over the years in our cosmic neighborhood that they've deemed "quasi-moons."

That includes the recently-spotted asteroid 2025 PN7, which appears to be the source of the rumor mill about Earth's supposed second moon.

Here's everything to know about the asteroid and why it's called a quasi-moon.