Universe is defined as the totality of everything that exists in the world. Universe includes all the subject matter present around us. The subject matter includes planets, stars, physical matter and energy that surround us. The term universe is also used for bodies like nature, cosmos. The universe is very enormous. The solar system comprises of nine planets which are in the shape of concentric circles. Our universe is infinite and has been growing in size continuously. The concentric circles are of finite sizes and these planets have their orbits rotating around the planet. There are many heavenly bodies and cosmologies that are present in our universe.
There are billions and billions of stars that one sees up in the sky. These are called the Milky Way and there are many other galaxies that exist around it. There have been several other kinds of radiations like the red shift which is present in the universe. The size of our universe has expanded because of certain cosmic inflation. This cosmic inflation affects diverse kinds of forces. National Aeronautics and Space Administration has been making numerous researches to help us know more about our universe. Many of these researches highlight the fact that the universe is expanding day by day. The observations made in the recent years show that the reason for expansion can be attributed to the dark energy present in the atmosphere. Dark energy is responsible for the inflation in the universe.
The astronomical observations show that the age of the universe is more than 13.75 billion years and their diameters have expanded by leaps and bounds over the past few years. The scientists and researchers have expressed the fact the space is expanding at faster rate as compared to the speed of light. It has now become very difficult to indicate the size of universe as it is not very easy to measure it.