On September 27th, something called a "Supermoon Lunar Eclipse" will happen. What does that mean?

There are two things that will happen.One is the supermoon. A moon is considered "super" when a full moon reaches the closest point to the Earth. This makes it appear about 14 percent larger and about 30 percent brighter.

The other thing is a lunar eclipse. These happen fairly often, just not at the same time as a supermoon. A lunar eclipse happens when the moon passes directly behind the Earth into the shadow the planet casts from the Sun.

This is super-rare. It's only happened five times since 1910, and scientists say it won't happen again until 2029. (Thanks to Katie Link at Newsy.com)