They're worried the rocks could be deadly for life on Earth.
in hopes that a future mission to the Red Planet will stop by, scoop them up, and bring them back to Earth for further study., potentially allowing dangerous microbes to come along for the ride.
Still, the remote-yet-possible risks are so immense that NASA is now evaluating plans to store Martian specimens at a US Air Force facility in Utah roughly a decade from now. NASA is planning to launch a sample return mission as soon as 2027, in collaboration with the European Space Agency. To prepare for the mission, Perseverance has been stuffing samples into hermetically sealed containers.But bringing those samples back to Earth doesn't come without risk, with groups like the International Committee Against Mars Sample Return, arguing it's not worth it.
Besides, Martian life would have a hell of a time surviving on Earth anyways, since it has an entirely different biosphere and physical conditions, experts argue.
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