1. The Earth in the Solar System

1. Answer the following questions briefly.

(a) How does a planet differ from a star?
Ans. Planets are spherical celestial bodies that do have light of their own but reflect the light from the sun. Examples: Earth is a planet and Sun is a star.

(b) What is meant by the “Solar System”?
Ans. The solar system means related to the family of the Sun. The Solar System solar system consists of our star, the Sun, and everything bound to it by gravity, the planets, dwarf planets, dozens of moons and millions of asteroids, comets and meteoroids.

(c) Name all the planets according to their distance from the sun.
Ans. The planets arranged according to the distance from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

(d) Why is the Earth called a unique planet?
Ans. The Earth is the only planet that has the favorable conditions to support life, like the presence of oxygen. It has bearable temperature for life, water and air that are essential for human survival. Also it has a ozone layer that protects the life from harmful radiations. Due to all the above reasons the Earth is a unique planet.

(e) Why do we see only one side of the moon always?
Ans. We see only one side of the moon always because, the moon rotates around the Earth at the exact same speed as it rotates around its own axis. As the same side of the moon is constantly facing the surface of the earth, we see only one of its sides.

(f) What is the Universe ?
Ans. The Universe is all of space and time and their contents,including planets, stars, millions of galaxies, and clouds of dust particles, gases, etc.

2. Tick the correct answer.

(a) The planet known as the “Earth’s Twin” is
(i) Jupiter (ii) Saturn (iii) Venus

(b)Which is the third nearest planet to the sun
(i) Venus    (ii) Earth      (iii) Mercury

(c) All the planets move around the sun in a
(i) Circular path      (ii) Rectangular path      (iii) Elliptical path

(d)The Pole Star indicates the direction to the
(i) South      (ii) North      (iii) East

(e)Asteroids are found between the orbits of
(i) Saturn and Jupiter      (ii) Mars and Jupiter      (iii) The Earth and Mars

3. Fill in the blanks.

(a) A group of stars forming various patterns is called a constellation.

(b) A huge system of stars is galaxy.

(c) Moon is the closest celestial body to our earth.

(d) Earth is the third nearest planet to the sun.

(e) Planets do not have their own heat and light.

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