A Martian rover landed on Mars today, but only after the U.S. space agency had to launch a rescue vehicle to the site.
The Mars Reconnaissance Orbiter and Mars Science Laboratory landed on the Red Planet on Sept. 3, 2017, after a 10-year journey from Earth.
It was the first time a spacecraft has been sent to Mars in almost three decades.
The agency has been working on the Mars 2020 rover since the 1970s, but it’s been stuck in Mars orbit since 2003.
NASA has been preparing for the Martian 2020 landing since 2013.
In January, the agency announced the first test flight of a Mars 2020 mission, with a test flight planned for 2018.
The test flight will include the use of an orbiter to measure the Martian atmosphere and water vapor, and will also include landing attempts to get data about the Martian climate and terrain.
The mission will be used to measure changes in Martian gravity, atmospheric composition, and surface temperatures, NASA said.