Nasa scientists have confirmed the existence of the an Earth-like planet outside our Solar System.
It's called Kepler 22-b and is circling a star similar to our Sun about 600 light years away.
The planet is about twice the size of Earth, with a temperature of around 22C.
That temperature is just right for liquid water - something that's important to support life.
"This is a major milestone on the road to finding Earth's twin," said Douglas Hudgins from the Nasa team.
The experts don't yet know whether the new planet is made up of rock, gas or liquid.
Kepler 22-b was discovered by Nasa's Kepler space telescope, which is on a mission to find planets like ours.
We asked what YOU would name a new planet...
So Kepler 22-b got us thinking - it's not the catchiest or most exciting name for a planet that could actually support alien life, is it?
We don't know how scientists come up with these planet names - but we asked you: if you found a new planet, what would you call it, and why?
Here's what you came up with!
"I would call it 'Videmus Vitam', it's Latin for 'we see life'."
Georgie, 12, Cardiganshire, Wales
"I would call it 'V.M.P.' for 'Very Mysterious Planet'."
Jaymee, 9, England
"I would call it 'Jeff' because that is my hamster's name. I love this new planet as much as my hamster."
Matthew, 13, Leicester, England
"I think it should be called 'Hydro' because it can support water!"
Riley, 12, Kent, England
"I'd call it 'Bieber' because Justin Bieber has always wanted to go into space."
Nuala, 13, Isle of Man
"I would name it 'Caelus', after the Roman god of the sky, because other planets are named after Roman gods. The sky would probably be different on Kepler 22-b because it will have a slightly different atmosphere and it is in a different solar system."
Daisy, 13, Leicester, England
"I would call the new planet 'Tawnelpen-11' because this is an anagram of 'new planet' and it has been discovered in 2011."
Charlotte, 8, Staffordshire, England
"I think it should be called 'Bleen' because in the picture it looks blue and green!"
Heather, 10, Worcestershire, England
"I think they should call it 'Eden' because it is very likely to support life, just like in the story! I really want to be an astrophysicist when I grow up and this would be a great place to study!"
Izzy, 11, Hampshire, England
"I would call the planet 'Reflect' because it's like a reflection of the Earth."
Levi, 11, Antrim, Northern Ireland
"I would name it 'Terram Novam' because it is Latin for 'New Earth' and it sounds cool."
Isabella, 13, Hampshire, England
"I would call it 'Birth' because it is a new planet and it rhymes with Earth."
Rose, 13, London, England
"I would call it 'Vitumnus', after the Roman god of Life , because this planet has just been discovered and it could be capable of harbouring multi-cellular life. Lots of planets in our solar system are named after Roman gods and goddesses."
Felicia, 12, Surrey, England
"I'd call it 'The Goldilocks Planet' because it is similar to Earth but bigger!"
Anna, 12, Newcastle, England
"I think it should be called 'Terra' because that is another word for earth."
Alexi, 13, Somerset, England
"I think you should call it 'Replica' since it looks the same as the Earth."
Antonia, 10, West Yorkshire, England
"I would call it 'Hope' because I hope that there is life in outer space."
Ellie, 12, West Midlands, England
"We shouldn't name it anything because if there are aliens on it they've probably already got their own name for it."
Tobias, 14, Cumbria, England
"I think the planet should be named after whoever discovered it."
Megan, 11, London, England
"I would name it 'Sapphire Iris' because it has a crystal-like feeling and it looks like the iris of an eye."
Freddie, 14, Milton Keynes, England
"I would call it 'Di-Earth' as 'di' means second."
Suzie, 11, York, England
"I would call the planet 'Mother Earth' as it's much bigger than Earth."
Suman, 13, West Midlands, England
"I think we should call the planet 'December 11'. It's catchy and easy to remember. It is also when it was discovered."
Rebecca, 11, Norfolk, England
"I would call it 'NASA' because NASA found it."
Ben, 13, Blackburn, England
"I would call it 'Planet Life' because there could be life forms on it!"
Corin, 8, West Midlands, England
"I would name the planet Diamond Blue because the planet is like a diamond blue colour."
Craig, 12, Bristol, England
"I'd call it Olliestar because it will be cool to have a planet named after me!!"
Oliver, 9, Devon, England
"2-D would be a cool name."
Tobi, 13, England
"I would call it planet FUDGE or planet OOZZEE."
Callum, 12, Poole, England
"I would call it N-earth (N for Nasa)."
Raymond, 11, High Wycombe, England
"I think that the planet should be called Arth because it's like Earth and the planet could be the same as Earth but it just has no E."
Georgia, 11, London, England
"I would call the new planet Heart because it's an anagram of Earth!"
Sophie, 13, Dorset, England
"We'd call the planet the following: Astron 5, Escalon or Psykon!"
Jacob & Daniel, 11 & 13, France
"I think it should be called Twix after the chocolate bar because there's a planet called Mars and it would be good to be called Twix!"
Abby, 11, Newcastle, England
"I would name it Sapphire Iris, because it has a crystal like feeling and it looks like the iris of the eye!"
Freddie, 14, Buckinghamshire, England
"I would call it Pandora because it reminds me of the film Avatar."
Jimmy, 13, Plymouth, England
"I would call it Hope because it is hope that there is life in outer space."
Ellie, 12, Midlands, England
"I would call a new planet Destiny, because it makes you feel like you are something special and so is everything else - we are amazing inventions and so is the universe. I think that more young people should get involved with the adult world by doing things like helping make important decisions like naming planets!"
Hannah, 12, East Lothian, Scotland
"I would name it Lucky. This is because we were lucky to find another planet similar to ours."
Max, 11, Florida, USA
"I'd love to call it Bristol-2, because it's very catchy!"
Macauley, 14, Bristol, England
"I would call it Planet 51!"
Alex, 12, Hampshire, England
"Neville4 or Visa7!"
Neve, 10, Norfolk, England