What else is different about this mission?
Perseverance is intended to be the first part of a robotic sample return mission from Mars. So instead of just drilling into the surface like the Curiosity Rover does, Perseverance will drill and core into the surface and
cache those little cores into tubes about the size of a dry-erase marker. It will then put those tubes onto the surface for a future mission later this decade to pick up and then bring back to the Earth.
Perseverance won’t come back to the Earth, but the plan is to bring the samples that we collect back.
In the meantime, we’ll be doing all of the science that any great rover mission would do. We are going to characterize the site, explore the geology and measure the atmospheric and weather properties.
How will you get those samples back to Earth?
This is where it gets a little less certain, because these are all ideas and missions in the works. NASA and the European Space Agency are collaborating on a concept to build and launch a lander that will send a little fetch rover that goes and gets the little tubes, picks them up and brings them back to the lander. Waiting on the lander would be a small rocket called a Mars Ascent Vehicle, or MAV. Once the samples are loaded into the MAV, it launches them into Mars orbit.
Then you’ve got this grapefruit- to soccer-ball-sized canister up there, and NASA and the Europeans are collaborating on an orbiter that will search for that canister, capture it and then rocket it back to the Earth, where it will land in the Utah desert. What could possibly go wrong?
If successful, that’ll be the first time we’ve done that from Mars. The scientific tools on the rovers are good, but nothing like the labs back on Earth. Bringing those samples back is going to be absolutely critical to getting the most out of the samples.
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