UNIVERSE: A MISTERY
UNIVERSE: AN UNREVEALED THEORY The universe is commonly defined as the totality of everything that exists Tudung all physical matter and energy, the planets, stars, galaxies and the contents of intergalactic space. The study of universe is known as Cosmology Cosmology = cosmos (universe) + logos (science) Galaxy is a vast system of billions of stars, which also contains a large number as clouds (mainly of hydrogen gas) and dust, isolated in space from similar systems There are about 100 billion galaxies (10 galaxies in the universe, and each valaxy has, on an average, 100 billion stars (10 stars) So, the total number of stars in the universe is 10 stars The Milky Way Galaxy is the home of the Earth and our Solar System. It is spiral in shape Milky Way Galaxy was formed 5 billion years after the Big Bang Latest known galaxy is the Dwarf Galaxy. > According to the modern thought, universe can be classified into two parts namely-(a) Atmosphere and (b) Space > Origin of the universe