(CNN)Way out beyond Mars, but before you get to Jupiter, is a planet. You read that right. There's a planet between Mars and Jupiter. You may not have heard of it, but it was discovered in 1801 -- 129 years before Pluto. It originally was called a planet, then later an asteroid and now it's called a dwarf planeIts name is Ceres (pronounced like series) and you'll likely be hearing a lot more about it in the coming weeks.