The universe is a huge wide-open space that holds everything from the smallest particle to the biggest galaxy. No one knows just how big the Universe is. Astronomers try to measure it all the time. They use a special instrument called a spectroscope to tell whether an object is moving away from Earth or toward Earth. Based on the information from this instrument, scientists have learned that the universe is still growing outward in every direction.
Origins of the Universe
The most popular theory of our universe’s origin centers on a cosmic cataclysm unmatched in all of history—the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed, in all directions, as if they had all been propelled by an ancient explosive force.
Scientists believe that about 13.7 billion years ago, a powerful explosion called the Big Bang happened. This powerful explosion set the universe into motion and this motion continues today. Scientists are not yet sure if the motion will stop, change direction, or keep going forever.
What is the Big Bang Theory?
Scientists believe that the Big Bang started with nothing- no space, no matter, no time and no energy. There was a very tiny, hot point, consisting of matter which had the potential to become something. This point then burst into the creation of the Universe. This Bang started time, created space and energy. Atoms began to form as soon as the point burst. After a certain period of time, galaxies begin to form. Some billion years later planets began to form and after some more millions years later, life started to form on Earth.
Scientists like Stephen Hawking, George Ellis and Roger Penrose have studied and researched on the Big Bang Theory. They believed that Big bang was the reason why space and time were created. These three scientists created and performed mathematical calculations to prove their theories.
Facts about the Big Bang Theory
- Our Universe is just a small part. There are many other Universes’ that exist. We live in a Multiverse. This idea came from the Big bang which might have given rise to bubble like structures which expanded in their own time.
- Astronomer Edwin Hubble, in 1920’s, discovered that the Universe is not static. It is expanding and contracting continuously.
- There is a dark energy that is making the Universe expand and accelerate at a larger rate than it did many years ago. There are many galaxies apart from our Milky Way that are moving further and further away.
- The Universe is infinite. It has no end. Thus scientists believe that the Universe is not a closed sphere but as flat as a sheet of paper and has no boundaries.
- According to the scientists the planets, stars and galaxies include only 4% of what a Universe consists of. 96% of the things in the Universe cannot be seen.