The depot will serve as a backup, in case Perseverance can't deliver its onboard samples to a rocket-toting lander.
Perseverance deposited the 10 tubes at the Three Forks depot in a zigzag pattern, placing each one 15 to 50 feet from its nearest neighbor to allow for easier helicopter recovery.
"Adding time to the depot-creation process, the team needed to precisely map the location of each 7-inch-long tube and glove combination so that the samples could be found even if covered with dust," JPL officials wrote in an."The depot is on flat ground near the base of the raised, fan-shaped ancient river delta that formed long ago when a river flowed into a lake there."
Now that its depot work is done, Perseverance will head up the ancient delta, examining the intriguing rocks as it goes. After the rover passes an outcrop the team calls Rocky Top, it will be in position to begin a new phase of its science mission called the Delta Top Campaign. "We found that from the base of the delta up to the level where Rocky Top is located, the rocks appear to have been deposited in a lake environment," Perseverance Project Scientist Ken Farley, of the California Institute of Technology in Pasadena, said in Monday's update.
"And those just above Rocky Top appear to have been created in or at the end of a Martian river flowing into the lake," Farley said."As we ascend the delta into a river setting, we expect to move into rocks that are composed of larger grains — from sand to large boulders. Those materials likely originated in rocks outside of Jezero, eroded and then washed into the crater.
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