Why is space black?
We have all been fascinated by space films since childhood. All films show space as a dark expanse. It's all black, with accents of color and various celestial bodies that radiate light here and there. There is a dark and black room. Holes that mark our universe. We are so familiar with the space around us, but we don't know why everything is so dark. Let's take a step and find out why the space we live in is this completely black expanse.
 What is space?
Science defines space as the unlimited three-dimensional extent to which objects and events have a relative position and direction. The concept of space is considered fundamental to understanding the physical universe. Space is everything that surrounds our planet, our solar system, etc. It has many effects on us and has extreme effects on everything else in general.
 Floating in space
If we were floating in space and hitting the sun, it would be so bright that our retinas would twitch. The rest of the sky, however, would be an expanse of soothing black, adorned with thousands of tiny, less fiery spots. We know for sure that our space is huge. It can even be called infinity, as looking into space in any direction would lead us to see even more of ourselves. The stars would be scattered everywhere. When we look, a bright spark from a heavenly body will look at us. Using this logic, it would be fair to assume that space should be as bright as a star since stars are all over the sky. the reality is a little different and everything was discovered when a famous scientist asked the question.
First possibility-Heinrich Wilhelm Olbers Paradox
The German astronomer Heinrich Wilhelm Olbers asked this famous question in 1823, and it became so famous that a paradox called Olbers Paradox was named in his honor. The paradox is this: if the universe is infinite, static, and eternal, then wherever you look it will eventually hit a star. As we know, there are stars and galaxies in all directions in space. If that's true, what is it something that's been tested, why does our star-filled space appear black? Is there a star in every direction we look? Our experience tells us that this is not the case. In proposing this fascinating paradox, Olbers said that the universe cannot be infinite, static, and timeless. The universe could be a combination of the two, but it is impossible to be a combination of all three. In the 1920s, Edwin Hubble, an elegant man in town, discovered that the universe is not static. Galaxies are moving away from us in all directions.
 The universe and its expansion
So we should somehow experience the brightness of a star in all directions, but we don't. Starlight can be said to be a source of light, but it does not illuminate all of space. Initially, visible light stretched and crawled towards the broad end of the electromagnetic spectrum until it became microwaves. This is cosmic microwave background radiation, and we can see it in all directions that we can see. Our universe today is infinite and this plays a key role in this phenomenon. Knowing these facts, we can understand that Olber's instinct was correct. It's just that the expansion of the universe is so great that it expands the wavelengths so that this light becomes invisible to our acts. However, if we could see the universe with microwave sensor eyes, we would see this: glowing in all directions.















