In geophysical terms, the moon is a planetary-mass object or satellite planet. Its mass is 1. 2% that of the earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of earth's (about as wide as the Ò€¦ A space race between the united states of america and the soviet union ensued in the following decade, culminating in the landing of two american astronauts, neil armstrong and buzz aldrin, on Ò€¦

What is the moon made of, and how did it form? Learn about the moon's violent origins, how its phases shaped the earliest calendars, and how humans first explored earth's only natural satellite half a Ò€¦