Earth has one moon.
A symbol in famous love songs , movies , poems , and folklore , many myths about the Moon date back to ancient history. In fact, the name Monday originates from Moon-day . The Moon glows by light it reflects from the Sun and is frequently the brightest object in the night sky. The above-pictured Full Moon occurs when the Moon is nearly opposite to the Sun in its orbit. Recent evidence indicates that the Moon formed from a colossal impact on the Earth about 4.5 billions of years ago, and therefore has a similar composition to the Earth.