If the Sun Is in Space, Why Is There Light on Earth but Not in Space? — Here’s What Scientists Explain

If you’ve seen photos of space, you probably notice that there is Earth and a glowing Sun, yet the space between them is dark. On the ground, the Sun lights up the sky and makes everything bright, but why does it not do the same in space, if it is located up there?

Well, the key idea here is that light is only visible when it interacts and hits something and then reaches your eyes. However, space is mostly nothing, with some dust and particles scattered across distances. So, light ends up not hitting anything until it reaches a planet like ours or a moon. But let’s dive deeper into how that comes into play for the space being as dark as it is.

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Light Travels Through Space, But Space Doesn’t Glow

Why There Is Light on Earth But Not in Space

The Sun sends light in all directions through electromagnetic radiation, which includes visible light, ultraviolet, and more. Those light waves can travel just fine even in the vacuum of space. But the tricky part is that you can’t see that light as it doesn’t glow in an empty space.

You only see light when it comes directly from the source, like someone looking directly at the Sun. Another would be if it hits and interacts with something like a dust particle, a spacecraft, the moon, or your hand. Then some of that light could be reflected into your eyes, allowing you to see an object brightly.

However, in most parts of space, there is nothing for that light to hit. There will be no atmosphere, no dust clouds, or other particles. Those could be present in some regions, but the space is so big that most of it is a vacuum. So, even if sunlight passes through certain locations, our eyes will not see a glowing beam of light or the space being bright.

Read more: NASA SpacePlace

Why Earth Is Bright While Space Looks Dark

Why Doesn’t the Sun Light Up Space?

So, what about Earth? Why is it bright here but not in space? Well, unlike space, Earth has an atmosphere, where sunlight hits air molecules, scattering in all directions. One of the reasons the sky looks blue. Also, the Earth has surfaces, such as the land, the oceans, and man-made buildings, which could all reflect sunlight. So, from Space, Earth also looks like a glowing ball of rock, when it is only reflecting the light that the Sun sends.

When you look at space from a bigger point of view, you may be able to see the Sun and other stars glowing brightly, possibly some planets and moons too, but the majority of the rest would be dark, not because light is not passing through them, but because that light will stay invisible unless it hits your eyes or something that you can see.

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Author's Final Thoughts

There is light in space, and lots of it, actually, but it stays dark not because light isn’t there, but because space is almost empty, and light will be hard to see without it interacting with another object you could see. So, the darkness between Earth and Sun, and the majority of the space, isn’t a lack of light; it’s just a place where light has nothing to bounce off on its way to your eyes.

Read next: If the Sun Is Burning Hot, Why Isn’t Space Warm? — Here’s What Scientists Found