1. Both Galaxies and Constellations are group of stars .Give two differences between them .
2. List four ways in which Planets are different from stars.
3. What majar factors have enabled life to evolve and survive on earth
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Answers
Ans 1: 1. A group of billions of stars make up a galaxy. Whereas a small group of stars that appear to form an imaginary pattern when viewed from the earth is known as constellation.
2. Our solar system is in the galaxy called the Milky Way whereas some important constellations are Ursa Major, Ursa Minor, Orion, Cassiopeia, etc.
Ans 2:
Planets
1. Planets do not twinkle in the sky.
2. They have no light.
3. They revolve around the sun.
4. Planets are small as compared to star.
Stars
1. Stars twinkle in the sky.
2. They have their own light.
3. They are fixed at a point.
4. They are very big in size.
Ans 3: All the factors necessary for life are present only on Earth are:
1. It has an atmosphere containing the gases, oxygen and carbon dioxide, which are necessary for life.
2. It has water in liquid form, which is essential for life.
Explanation:
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