New research has shown that billions of years ago, there was more than just water present on Mars, but entire rivers and lakes.
This newest research shows the first ever evidence that there were rivers and lakes on Mars' surface around 3.7 billion years ago.
Scientists made the discovery after studying some of the very detailed pictures taken of the Hellas Basin, a HUGE crater in the south of Mars, by Nasa's Mars Reconnaissance Orbiter.
Scientists were able to 'read' the rocks from these super detailed images to find out its geology and history.
The research revealed that rivers existed on the planet for around 100,000 years, and they were similar to the rivers we have here on Earth.
Researchers even believe the water may even have got there by rain or hail, just like it does on Earth.
