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Why are objects in space visible if they do not emit their own light?

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What must an object do to be seen if it does not emit light of its own?

It must either reflect light, as in the case of the Moon under ordinary circumstances, or block light, as in the case of the Moon during a solar eclipse. Of course in everyd

What object emits its own light?

The Sun. And also: when electrons go from excited state back to ground level, the energy that they had transforms into light which is given off.

What objects are visible because they emit light?

 stars  meteors  fireflies  flashlights  incandescent filaments  toaster coils  LEDs  party light sticks  fluorescent tubes  fluorescent minerals  static electrica

How do scientist know that black holes exist if these objects don't emit visible light?

Black holes do not, themselves, emit light. But the area around them does. Not light as we think of it, but highly energetic X-rays caused by the mass AROUND the black hole as