*´ºÉ«Ö±²¥

Nelson said he “pulled the plug� months ago on the original sample return plan given the soaring costs and the delay in getting anything back from Mars before 2040.

NASA last year asked industry and others to come up with better options to ensure the samples collected in cigar-size tubes by arrive here in the 2030s, well ahead of astronauts venturing to the red planet.

“We want to return 30 titanium tubes as soon as possible at the cheapest price," Nelson said

The space agency said it is considering two options that would cost in the $6 billion to $7 billion range, including one that would feature innovative designs by commercial partners. The number of spacecraft and launches would remain the same, but NASA said the proposed options would streamline the mission.

A final decision would come next year, following engineering studies laying out the details of each option. The more traditional alternative would use the same landing method that lowered NASA's Perseverance and Curiosity rovers onto the Martian surface — a rocket-steered platform known as a sky crane. The second option would include a landing system developed by private companies; details were short on this path during the latest update.

Perseverance has collected more than two dozen samples since its 2021 landing, with more to come in NASA's high-priority search for signs of ancient, microscopic Martian life. Scientists want to analyze the samples from the red planet's long-dry river delta in labs on Earth.

NASA officials stressed that both options would simplify things by having the sample tubes cleaned on the surface of Mars, versus in the returning spacecraft, and switching from solar to nuclear power in order to endure Martian dust storms.

Nelson said it will be up to the incoming administration to decide how best to retrieve the Mars samples, with the need for money to start flowing now to accomplish it. For Nelson's replacement, Trump has nominated tech billionaire Jared Isaacman, who's rocketed into orbit twice on his own dime.

“What we wanted to do was to give them the best possible options so that they can go from here,� Nelson said.

___

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.