Moon
Context
The natural satellite of the Earth, visible (chiefly at night) by reflected light from the sun
Explanation
The Moon orbits the Earth and is its only natural satellite. It affects the Earth's tides, stabilizes its axis, and provides light during its various phases.
Applications
The full moon illuminated the night sky.
Lunar eclipses occur when the Earth comes between the sun and the moon.
The moon's surface is marked by craters and has been visited by astronauts.