Assertion: asteroid belt's asteroid | /r/HasProperty | observed
Facets:
Source sentences:
text: On the other end of the scale, the smallest asteroid ever studied is the 6-foot-wide (2 meters) space rock 2015 TC25, which was observed when it made a close flyby of Earth in October 2015.
text: They grouped the asteroids by size and composition, and mapped them into distinct regions of the Solar System where the asteroids were observed.