Question

Why aren't manned missions to space anymore performed?​

Answer 1

Explanation:

The Space Shuttle program was expensive to operate, and maintaining the twenty-plus year old Orbiters was getting more costly. The Space Shuttle was essential for completing the ISS, but would not be helpful for the new program (called Constellation) that would take us out of low Earth orbit.

Answer 2

On Dec. 13, 1972, scientist-astronaut Harrison Schmitt is photographed standing next to a huge boulder during the final Apollo moon-landing mission, Apollo 17. This mosaic is made from two photos shot by fellow Apollo 17 moonwalker Eugene Cernan. (Image credit: Eugene Cernan/NASA)

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