NASA scientists believe they may have found evidence of water flowing on Mars.
If so, it increases the chance that there could be life in some form on the Red Planet.
Images from a NASA Reconnaissance Orbiter resemble images of water flow on Earth.
It is thought the water flows in the summer months before fleezing in the winter.
Geophysicist Phil Christensen explained: “We know Mars has a lot of ice, but this is the first time we’ve seen the potential for liquid water. It might be salty water but it’s still liquid. And I think that’s the key here. It’s not that Mars doesn’t have a lot of ice, but liquid water, certainly to an organism, is very, very different than ice.”
In 2004, NASA landed two Mars Rover on the planet and they have sent back a huge quantity of information ever since.
This latest development is a boost to the US space programme following the end of service of the space shuttles last month.