Assertion: asteroid belt's asteroid | /r/Synonym | m-type
Facets:
value: with being less frequent
type: OTHER
Source sentences:
text: The asteroids that are hard to mine are known as M-type (metallic).
text: Most asteroids are P and M-type asteroids, with E-type asteroids being less frequent.
text: Metallic asteroids, also known as M-type asteroids, make up the least portion of the asteroid belt.