Here's why:
* The Moon's surface area is much smaller than Earth's. This means that even if the Moon were receiving the same amount of sunlight per square meter as Earth, the total amount of light it receives would be significantly less.
* The Moon has no atmosphere. This means that all the sunlight that hits the Moon's surface is absorbed or reflected directly, with none being scattered or absorbed by an atmosphere.
* The Earth's atmosphere scatters sunlight. This means that the light from the sun is spread out over a larger area, making it appear dimmer on Earth than it would on the Moon.
In short: The Moon receives a lot of light from the sun, but Earth receives more total light because it has a much larger surface area.
