The Earth's Moon
The Earth may only have one Moon, but it's a big one! The Earth's
Moon is the fifth largest in the whole solar system. But it is still
smaller than the Earth, so objects weigh less on the Moon than they do
here. That's why the astronauts could enjoy bouncing around on the
Even though the Moon has no liquid water, it does have special "seas" and "land" on its surface. There are
also many interesting features such as craters, mountain ranges, and
lava plains. The interior of the Moon is made up of different layers
of rock, some solid and some molten like lava. By studying the Moon's
surface and interior, geologists can learn about the Moon's geological history and its formation.
The footprints left behind by the Apollo astronauts will last for many
thousands of years because there is no wind on the Moon. The Moon has
no atmosphere, so there is no weather to erase the footprints. On
the Earth, the atmosphere acts as a blanket, keeping the warmth of the
Sun in even at night. Because there is no atmosphere on the Moon, the
temperatures there are very hot during the day (100 ° C) and very cold
at night (-173 ° C).
The Moon doesn't produce its own light, but looks bright because it
reflects light from the Sun. Think of the Sun as a light bulb, and the
Moon as a mirror, reflecting light from the light bulb. The lunar phase changes as the
Moon orbits the Earth and
different portions of its surface are illuminated by the Sun.
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