Earth has company.
A group of astronomers have published a new study that says there are at least 8.8 billion habitable earth-type planets in our galaxy alone.
These are worlds that are about the size of earth, orbit a star like ours, and exist in the so-called "Goldilocks zone" where it's not too hot and not too cold.
Just to give you an idea of how many planets that is -- if the astronomers' findings are accurate, there are more habitable planets in this galaxy than there are people on earth.
But there may be even more: the astronomers say they only looked at stars like our sun.
Other types of stars, like red dwarfs, could support earth-like planets too.