NASA's InSight Lander successfully landed on Mars after a journey of six months.
But what are they hoping to find on the Red Planet and how long do they think the mission will take?
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The rocket carrying the lander set off into space from California on May 5Credit: EPA
When did Nasa's Mars probe InSight land?
Nasa launched the Mars InSight lander rocket on May 5, 2018, from a base in California and it landed on the Red Planet on November 26, 2018.
It is Nasa's first in-depth investigation which will be focusing solely on the Red Planet.
Touchdown was confirmed just after 7.50pm GMT.
It landed on a flat plain known as Elysium Planitia, close to Mars' equator.
The probe entered the planet's atmosphere faster than a bullet and used the combination of a heatshield, parachute and rockets to bring itself to a gentle stop.
It now has to start creating its own energy to operate its systems as well as to keep them warm in the sub-zero temperatures.
How long will the space mission take?
The rocket will spend another two years in space.
The lander will take samples and carry out tests to find out how the planet is formed.
But in Mars time, this will work out as only one year, because Earth and Mars have different time zones.
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Nasa engineers celebrate after the InSight lander touched down on MarsCredit: AP:Associated Press
What are they hoping to find on the Red Planet?
Nasa have started the probe because they want to discover what makes up the planet, after feeling "Marsquakes".
These are tremors in the underground rock, and the lander will put seismometers on the surface of the planet to feel for them.
If successful, the mission may reveal whether it is really possible to live on Mars.
Nasa said: "Each Marsquake would be like a flashbulb that illuminates the structure of the planet's interior.
"By studying how seismic waves pass through the different layers of the planet (the crust, mantle and core), scientists can deduce the depths of these layers and what they're made of.
"In this way, seismology is like taking an X-ray of the interior of Mars."
Mapping the inside of Mars will also help scientists learn more about how other rocky planets, such as Earth, are made up.
What research have we conducted on Mars before?
Nasa's first mission to Mars was in 1971 - the Soviet Space programme.
It was a major success and managed to land on the surface, which is something that only in every three missions to Mars have managed.
The Mars 3 orbiter returned eight months of data but for only about 20 seconds before it went dark.
Researchers were able to gain understanding on the planet's atmosphere, surface, weather and topography.
Nasa's Mariner 9 followed, bringing back more information - capturing more images of the strange world.
Mars Pathfinder launched in 1996 and proved that a free-moving rover vehicle could travel on the planet's surface.
The most famous of all missions was in 2004 when two rovers, Spirit and Opportunity, reached opposite sides of Mars and have explored the planet in far more detail than other missions.
