When we say the Moon shines, we don't mean it makes its own light like the Sun. The Moon is more like a giant mirror reflecting sunlight back to Earth.
Long ago, people thought the Moon might have its own light source. It wasn't until scientists studied how light works that we realized the Moon reflects sunlight. Thinkers like Anaxagoras proposed early ideas about reflected sunlight, but it took telescopes and careful observation to confirm!
The different shapes we see of the Moon (like crescent, half, and full) are called phases. These phases happen because of how much of the sunlit side of the Moon is facing us as it orbits Earth.
You can demonstrate how the Moon shines by using a mirror and a flashlight. In a darkened room, shine the flashlight (like the Sun) onto the mirror (like the Moon). Notice how the mirror reflects the light onto the wall. That's what the Moon does!
The intensity of reflected light can be described by albedo ($\alpha$), which is the ratio of reflected light to incident light. A higher albedo means more light is reflected. The Moon's albedo is about 0.12, meaning it reflects about 12% of the sunlight that hits it.
So, the next time you see the Moon shining brightly in the night sky, remember it's just reflecting sunlight! It's a cosmic mirror helping to light up our nights.
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