Something Difficult to Grasp or Puzzling
This page is the CodyCross answer for the clue below from Space Exploration, Group 916, Puzzle 3 (Scientific Research).
Question is: Something Difficult to Grasp or Puzzling
and the answer is: ENIGMA
Word Meaning:
ENIGMA — Something or someone puzzling, mysterious or inexplicable.
Definitions from Wiktionary.