Universe
• The universe is commonly defined as the totality of everything that exists,
• Including 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)
• The universe has no limit.
Galaxy
• Aalaxy is a vast system of billions of stars, which also contains a large number
of gas 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 galaxy has, on an average, 100 billion stars (1011 stars). So, the total number of
stars in the universe is 1022 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 is explained by the Big Bang Theory, formulated and
Proposed by the Belgian astronomer and cosmologist Georges Lemaitre.
• Andromeda is our nearest galaxy
The Big Bang Theory
• All the matter in the universe was originally a concentrated lump called
Primeval atom.
• Big Bang was an explosion that occurred 15 billion years ago, leading to the
Tormation of galaxies of stars and other heavenly bodies.
• Since then, all the galaxies have been flying away from one another causing
expansion of the universe.
• The universe is commonly defined as the totality of everything that exists,
• Including 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)
• The universe has no limit.
Galaxy
• Aalaxy is a vast system of billions of stars, which also contains a large number
of gas 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 galaxy has, on an average, 100 billion stars (1011 stars). So, the total number of
stars in the universe is 1022 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 is explained by the Big Bang Theory, formulated and
Proposed by the Belgian astronomer and cosmologist Georges Lemaitre.
• Andromeda is our nearest galaxy
The Big Bang Theory
• All the matter in the universe was originally a concentrated lump called
Primeval atom.
• Big Bang was an explosion that occurred 15 billion years ago, leading to the
Tormation of galaxies of stars and other heavenly bodies.
• Since then, all the galaxies have been flying away from one another causing
expansion of the universe.
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