Question

why the sun can not light the space like our earth? the space is much closer to the sun than earth!​

Answer 1

It does, were you to look at the sun directly in space, you'd be blinded. That's the point of those gold visors on space suits. The reason it doesn't appear to is that there's very little for the light to strike. Think of shining a flashlight into the air, it has effectively no visible effect. Now if you shine it at a tree, it gets nice and bright. It's the same amount of light, but it doesn't appear so because we can't see it travel. Now if you mean why isn't space blue, like the sky, that's because when sunlight filters through the atmosphere, it's interaction with the various gasses scatter the blue light most, giving us that nice hue. Space, obviously for the most part lacking an atmosphere, doesn't scatter the light, hence the black.

Answer 2

Answer:

I do not have a definite reason to give you, but I have an untested, falsifiable theory that may spark your interest: We do not see light unless it is being absorbed by our eyes, right?

Well, here’s what I think:

We only see light sources if the photons emitted from them are being absorbed by our eyes. For example, I see a chair in my kitchen because the photons from the chair are being reflected into my eyes. I see a light turned on because the light is emitting photons into my eyes.

Earth orbits the sun 100,000 times closer than the Oort Cloud, at an average of 92,955,807 miles (149,597,870 km). The distance from Earth to the sun is called an astronomical unit, or AU, which is used to measure distances throughout the solar system. Jupiter, for example, is 5.2 AU from the sun