Assertion: body's force | /r/CapableOf | compare requisite to keep the moon
Facets:
Source sentences:
text: In his own words, "I deduced that the forces which keep the planets in their orbs must [be] reciprocally as the squares of their distances from the centers about which they revolve: and thereby compared the force requisite to keep the Moon in her Orb with the force of gravity at the surface of the Earth; and found them answer pretty nearly.