The design for a huge rocket to take humans to asteroids and Mars has been unveiled by the US space agency Nasa.
The Space Launch System (SLS), as it is currently known, will be the most powerful launcher ever built - more powerful even than the Saturn V rockets that put men on the Moon.
On top of the SLS, Nasa plans to put its Orion astronaut capsule, which is already in development.
The agency says the first launch should occur towards the end of 2017.
This will be an uncrewed test flight, and it is estimated the project will have cost $18bn (
The Space Launch System (SLS), as it is currently known, will be the most powerful launcher ever built - more powerful even than the Saturn V rockets that put men on the Moon.
On top of the SLS, Nasa plans to put its Orion astronaut capsule, which is already in development.
The agency says the first launch should occur towards the end of 2017.
This will be an uncrewed test flight, and it is estimated the project will have cost $18bn (