Perhaps the most MOST interesting and puzzling material to be found inside rocks that have come from outer space is:

Question

Quizplus · Accepted Answer

Amino acids or proteins found in meteorites are fascinating because they suggest the possibility of extraterrestrial life or the delivery of the building blocks of life to Earth. These organic compounds have been found in several types of meteorites, including the famous Murchison meteorite that fell in Australia in 1969.

Perhaps the Most MOST Interesting and Puzzling Material to Be