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Universe - Earth & Universe (in tamil)
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universe has unlimited size and unknown shape. All the existing things include galaxies, planets, satellites, comets, and meteors. The solar system is located in Milky Way galaxy. The Milky Way galaxy is a medium sized galaxy, which consists of about 150 billion of stars. Astronomers believe that there are 1012 such galaxies in the universe. Astronomical unit (AU), Lightyear (LY) and parsec are used to measure the distance in the universe. Here in this course I am going to explain Universe

Karthick Selvaraj
Founder of Karthick Academy (YouTube Channel) Get Our Android App from the Google Play Store.

Unacademy user
thanks mam for your effort. nice lectures... best wishes....
  1. GEOGRAPHY EARTH & UNIVERSE UNIVERSE


  2. Millions of constellations of stars seen in the sky is called a galaxy Thousands of galaxies form the Universe The Universe is vast & ever expanding Research & experiments are still being carried out Milky way Galaxy is one among the many galaxies The Andromeda Galaxy (M31) is the closest spiral galaxy to Milky Way Galaxy


  3. Milky Way Galaxy The twinkling stars that are seen on a starry night are actually like the Sun, but are far away Many of these stars are hundreds & thousands times bigger than our Sun They are seen only as a small spot Scientists have found that planets revolve around these stars


  4. Millions of stars, including the Sun & other celestial bodies which can be viewed with our eyes belong to the Milky Way Galaxy A white streak of light can be seen on a clear night for few days Our ancestors called this as the Milky Way Galaxy In India it we called it as Akash Ganga


  5. Milky Way Galaxy is a dense cluster of stars They appear as a tiny dot of light because they are far away We live on the Earth, which is the part of the Solar System, present in the Milky Way Galaxy


  6. The Solar System The Solar family consists of the Sun, its eight Planets, Dwarf Planets, Satellites, thousands of Asteroids, Meteoroids, Comets We can see Sun, Moon & 5 Planets with naked eyes The Earth is also a Planet Different kinds of life including human beings are found on Earth because the Earth's atmosphere has oxygen


  7. Other than the Earth, all the other Planets have no oxygen & other gases hence life does not exist in these Planets All Planets revolve around the Sun in an elliptical path, approximately at the same plane The path that the Planet takes to revolve around the Sun is called Orbit