Space Rock That Can Form a Belt
Puzzle 19 of Running a Marathon Pack
Question is: Space Rock That Can Form a Belt
and the answer is: ASTEROID
Word Meaning:
ASTEROID — (astronomy) A naturally occurring solid object, which is smaller than a planet and a dwarf planet, larger than a meteoroid and not a comet, that orbits a star and often has an irregular shape.
Definitions from Wiktionary.