What comes to your mind when you hear about the word Cosmology…?
How big is the universe? Is there an end to it? How far can we travel into this deep cosmos?
Our brain struggles to answer these enigmatic questions. The universe is about 13.8 billion years old, so any light we see has to have been travelling for 13.8 billion years or less. Yeah, let that sink in. We call this the Observable Universe. The Observable Universe only contains the light that has had time to reach us. Beyond that, everything is a mystery to us. According to the theory of cosmic inflation, the universe’s size is at least 10^23 times larger than the size of the observable universe.
Let’s warp back to the start, the Big Bang!
The Big Bang Theory is a leading explanation about how the universe began. Almost everything that we understand about the Big Bang comes from mathematical theory and models as the current instruments don’t allow us to peer back at the universe’s birth.
In an instant, space and the building blocks of matter were created, and time began. From that moment, the Universe began to expand, and continues to expand today. We are unaware of what existed before the Big Bang.
From singularity to this enormity, the ever expanding universe has offered us so many mysteries.
In all this vastness, Earth was born around 4.54 billion years ago and still, we are unable to find life elsewhere. Isn’t it thought provoking?
Earth. Our only home.
During my childhood days, when I used to look to the stars every night hoping to see a shooting star pass by, thinking that it would make my wishes come true, fascinated me very much. My curiosity for this topic knew no bounds. This then gradually grew into a hobby, I read all the things related to cosmology that I came across, and now this interest has motivated me to write about it.
Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious.