Everyone knows and loves the moon. What you may not know is that it's not Earth's only natural satellite. In 1997, another body was discovered, 3753 Cruithne, also called a quasi-orbital satellite of Earth. This means that Cruithne doesn't orbit Earth in a nice ellipse the same way our moon does. Instead, Cruithne scuttles around the inner solar system in what's called a horseshoe orbit.
The video illustrates what a horseshoe orbit looks like, specifically for Cruithne orbiting around Earth. This is something not widely known, but this type of orbit is actually pretty common in our solar system. Cruithne's orbit is so wide, that its sometimes goes into the neighborhood of Venus and Mars. It orbits the sun about once a year, but it takes nearly 800 years to complete this messy ring shape around Earth's orbit.Keep Reading