Are they following us?: Inside the world of quasi-moons

Earth has seven of them. They’re not just asteroids, and not exactly moons. They don’t stay linked to a planet indefinitely. And we’ve only known of them since 2002.

Are they following us?: Inside the world of quasi-moons
Earth has seven of them. They’re not just asteroids, and not exactly moons. They don’t stay linked to a planet indefinitely. And we’ve only known of them since 2002.