The universe has been a mystery since the beginning of time. The earliest humans were able to make observations about the sky and make some inferences, but it wasn't until the scientific revolution that we started to make progress.
The late 1800s marked a turning point where we could start to figure out what was going on in our universe with a little more certainty. One of the most important contributors to our understanding of the universe was Albert Einstein. In his 1905 paper ( Annus mirabilis papers) , he predicted that there must be something that was unseen in the universe, and now astronomers are on the hunt for this mysterious material called Dark Matter.
In order to understand why Dark Matter is so important, we first need to understand what it is. Astronomers know that it must exist because they can measure the gravitational effects of the invisible material, but they don't know what it's made of or where it's located. The evidence for Dark Matter comes from two different sources: supernovas and galaxies.
Supernovas are exploding stars that can be seen from across the universe, and they release a type of radiation called a gamma ray burst. These bursts of gamma rays happen when a star's core collapses and then explodes, and they travel at light speed. When astronomers look at nearby galaxies, they see that the gamma ray bursts are moving faster than they should be if gravity was the only thing affecting them.
The other source comes from observations of clusters of galaxies. They're made up of hundreds, if not thousands, of galaxies, and they have far too much mass than would be expected from their visible component. This means there must be some other type of force affecting them, and Dark Matter is one possible explanation for this.
There are many different theories about what Dark Matter might be made of, but none of them have been proven yet.
Astronomers know that it's not made of regular matter like atoms because those would emit some form of light and heat, and we haven't seen any sign of this. It's possible that Dark Matter could be made up of some type of exotic particle that we haven't discovered yet, or it could be some type of black hole or even just empty space. We just don't know for certain yet.
But what we do know for certain is that Dark Matter is probably the most important part of our universe. It affects everything in it, finding Dark Matter will help to better understand many of the mysteries about the universe and our place within it. It could even shed light on the Big Bang and Dark Energy and help us understand more about the very beginning of our universe.
I think dark matter is just black holes.