| A | B |
|---|
| Lunar average density | about the same as the Earth |
| collision theory | explanation of Lunar origin |
| Galileo | discovered lunar craters and maria |
| Lunar craters | meteoroid impact areas on the Moon |
| Lunar maria | dark, flat areas on the Moon |
| JFK | president credited with launching the American space program |
| Eagle | first American Lunar Module to land on the Moon |
| Armstrong | first person to set foot on the Moon |
| Lunar buggy | used by astronauts to explore the Moon |
| Lunar rocks | much of what we know about the Moon comes from them |
| farside | rougher than the Moon's nearside |
| Command Module | left in orbit while Lunar Module descends to surface |
| Apollo 11 | American mission name to land on the Moon |
| Sea of Tranquility | where, "The Eagle has landed." |
| seismometer | used by American astronauts to detect moonquakes |
