NASA on Tuesday said it has canceled the March 2016 launch of a space probe that was designed to give scientists a deeper look inside Mars.

The space agency said project managers decided to cancel the launch of their Interior Exploration using Seismic Investigations Geodesy and Heat Transport (InSight) mission after repeated attempts failed to fix a leak in a critical scientific instrument onboard the spacecraft.

“Learning about the interior structure of Mars has been a high priority objective for planetary scientists [for decades],” said John Grunsfeld, associate administrator for NASA’s Science Mission Directorate. “We push the boundaries of space technology with our missions to enable science, but space exploration is unforgiving, and the bottom line is that we’re not ready to launch in the 2016 window.”

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