What makes up our universe, and where are we located within this universe? Although running through the multiple components of our immense universe may be rather hard to accomplish in a few sentences, I will certainly do my best.
Let’s start out with the section of our universe that we know the best, our solar system! Our solar system is one of 100-400 billion solar systems in the milky was galaxy. Along with the Andromeda Galaxy and more than 50 dwarf galaxies, we can be found in the local group, (the end of our postal mailbox). The local group spans about 10 million light-years in diameter and is part of hundreds of galaxy groups which make up the laniakea supercluster. This supercluster is one of billions in the observable universe. This may seem like a lot of information to take in all at once, but to get to the point, our universe is unimaginably massive.
Now what if I told you that the boundaries of human exploration are limited to the local group. We are confined to a small section of our universe that currently makes up 0.00000000001% of our observable universe.
How can this be true? Can’t we simply advance our technology far enough to travel and explore the distant reaches of our galaxy? Unfortunately not… The reason we are bound to such a microscopic fraction of our universe is because our universe is constantly expanding.
The reason for our universe’s constant expansion is derived from the beginning of our universe, or in other terms, the big bang. The best way I can explain the big bang is telling you to picture the entire universe inside a small marble approximately 13.8 billion years ago. Within fractions of a second, this marble started expanding to transform microscopic distances to galactic distances.
Gravity tried its best to hold the entire universe together within a compact area, but the big bang was far too powerful. The universe is now ever expanding since its initial creation while carrying the billions of galactic clusters with it. Gravity managed to hold together these billions of galactic clusters, however the distance between these galactic clusters is constantly increasing at an unimaginable rate while our universe continues to expand.
This bind-boggling information unfortunately tells us that as we remain isolated within the local group, the dark energy (nothingness) between the local group and other galaxy cluster continuously expands. We can attempt to travel through this dark nothingness of our universe in the far future, however, we will never reach another galactic cluster other than our own.
Another rather sad truth is that the galactic clusters that we can currently view in the night sky will one day disappear. The universe as we know it will recede from view. A being born in the far future will assume that our galactic cluster is the only place to explore in the universe. When this being looks far into the empty space, they will only see more emptiness and darkness.
This may seem like a dark and rather unappealing future, but thankfully there are billions of unexplored planets and solar systems within our local group that we still have not come close to exploring. For now, be grateful to have the incredible luck to be able to look into space and view our extraordinary past in the galactic clusters that currently fill our night sky.
Never stop Questioning.