The rover's astrobiology mission will seek signs of past microscopic life on Mars, explore the geology of the Jezero Crater landing site, and demonstrate key technologies to help prepare for future robotic and human exploration. And the rover will do all that while collecting the first samples of Martian rock and regolith (broken rock and dust) for return to Earth by a set of future missions.
The Mars 2020 mission has been slated to lift-off this summer ever since the agency announced the project in December 2012. Owing to the relative positions of Earth and Mars to each other, launch opportunities come up only every 26 months.
If Perseverance didn't head to Mars this summer, the project would have to wait until September 2022 to try again, seriously impacting the long-term objectives of NASA's Mars Exploration Program and increasing overall mission risk.
NASA administrator Jim Bridenstine said, "Today we stand at the threshold of another monumental moment in exploration: sample collection at Mars. As we celebrate the heroes of Apollo 11 today, future generations may well recognise the women and men of Perseverance – not only for what they will achieve 100 million miles from home, but for what they were able to accomplish on this world on the road to launch."
Significant challenges come with the territory when planning a Mars mission. In the case of Perseverance – the heaviest payload yet to go to the Red Planet – those included implementing an entire test project to confirm the soundness of their parachute design.
There was also an extensive effort to hone the performance of the rover's Sample Caching System, the most complex and the cleanest mechanism ever sent into space. But of all the hurdles faced by the men and women of Perseverance, the coronavirus pandemic provided the greatest challenge, with safety precautions requiring much work to be done remotely.
Amid the added strain of staying on schedule while incorporating additional precautions – and keeping friends, families and colleagues safe – the Mars 2020 mission team has been acutely aware of the dedication and hard work of people in the medical community around the world during the pandemic.
With them in mind, the mission installed a plate on the left side of the rover chassis, between the middle and rear wheels.
The graphic on the eight-centimetre-by-13-centimetre aluminium plate depicts Earth, supported by the medical community – represented by the ancient symbol of the serpent-entwined rod. A line depicting a spacecraft's trajectory rises from central Florida towards Mars, represented as a small dot in the background.
Matt Wallace, Perseverance deputy project manager at JPL, added, "We wanted to demonstrate our appreciation for those who have put their personal wellbeing on the line for the good of others. It is our hope that when future generations travel to Mars and happen upon our rover, they will be reminded that back on Earth in the year 2020 there were such people."
All the major spacecraft components of the rover mission (from the aeroshell and descent stage to the cruise stage and rover) are now in the configuration they will be in on the launch pad at Kennedy Space Centre in Florida.
Later this week, they'll be enclosed in the payload fairing that will protect them during launch. Next week, the fairing and spacecraft will be transported to Space Launch Complex 41, where they'll be attached to the top of a United Launch Alliance Atlas V rocket.
The Perseverance rover's astrobiology mission will search for signs of ancient microbial life. It will also characterise the planet's climate and geology, pave the way for human exploration of the Red Planet, and be the first planetary mission to collect and cache Martian rock core and dust samples.
Subsequent missions, currently under consideration by NASA (in conjunction with the European Space Agency), would send spacecraft to Mars to collect these cached samples from the surface and return them to Earth for in-depth analysis.
The Mars 2020 mission is part of a larger program that includes missions to the moon as a way to prepare for human exploration of the Red Planet. Charged with returning astronauts to the moon by 2024, NASA will establish a sustained human presence on and around the moon by 2028 through NASA's Artemis lunar exploration plans.
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