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NASA Mars Mission Faces Setback After Heat Shield Cracks Under Pressure

NASA setback: heat shield on Mars probe cracks

A critical part of NASA's next $2 billion rover mission to Mars broke during testing earlier this month.

The Mars 2020 mission's heat shield was undergoing stress-testing when it developed a crack that appeared around its entire circumference. The shield is designed to protect the rover as it enters the Martian atmosphere.

"The test was designed to subject the heat shield to forces up to 20 percent greater than those expected during entry into the Martian atmosphere," NASA said in a statement. The crack was "unexpected" according to the release, and engineers will have to build a new shield for the mission.

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