It isn't completely black in space. There is a lot of light, but that light is only visible when looking at the source or when looking at an object from which the light has reflected.
Look at this picture. There are no artificial lights being used. The astronaut and the Earth below are both visible because of the light that is being emitted by the Sun. That light strikes the astronaut and Earth and reflects off of them and then is intercepted by either the camera (in this case) or the eyes of any other astronauts that are there.
It can be very bright, in space, because the Sun emits so much light. Everything one looks at will appear bright because it is reflecting that light. Space still appears black because it is empty. There isn't something there to reflect the Sun's light, so the light keeps traveling, away from us.
The astronauts performing space walks often have to lower their outer visor (that is covered in a thin layer of gold), much like we would put on sunglasses on a bright day on Earth.
Look at this picture. There are no artificial lights being used. The astronaut and the Earth below are both visible because of the light that is being emitted by the Sun. That light strikes the astronaut and Earth and reflects off of them and then is intercepted by either the camera (in this case) or the eyes of any other astronauts that are there.
It can be very bright, in space, because the Sun emits so much light. Everything one looks at will appear bright because it is reflecting that light. Space still appears black because it is empty. There isn't something there to reflect the Sun's light, so the light keeps traveling, away from us.
The astronauts performing space walks often have to lower their outer visor (that is covered in a thin layer of gold), much like we would put on sunglasses on a bright day on Earth.
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