* Planets: Planets themselves don't emit light. They shine because they reflect sunlight. Think of them like giant mirrors reflecting the sun's rays.

* Moon: The Moon, like planets, is a non-luminous body. It shines because it reflects sunlight. The amount of light we see depends on the Moon's position relative to the Sun and Earth.

So, in short, the planets and the moon shine because of the sunlight that they reflect.