The Universe
EXERCISES
1. Answer the following questions briefly.
(a) How does a planet differ from a star?
(b) What is meant by the "Solar System?
(c) Name all the planets accorcling to their distance from the sun.
(d) Why is the Earth called a unique planet?
(e) Why do we see only one side of the moon always?
(f) What is the Universe ?
Answers
Answer:
a) planets r larger and has defined shape where as stars dont.
b) a group of palnets along with their satellite moving in defined paths and having a sun is called a solar system
c) mercury, venus, earth, mars, jupiter, saturn, uranus, neptune.
d)because it has life and has water which is not frozen or hot and is at a safe distance from the sun and has ozone
e)because earths rotation and moons rotation is opposite direction thus v r only able to c one side
f) group of stars, planets, satellites, suns, comets etc make up the universe
1. a Ans: i) Planet does not have its own light while star emit their own light.
ii) Planet revolves around a star while does not revolve around any celestial bodies.
1. b) Solar System is the gravitional bound system of the Sun and the objects that orbit it either directly or indirectly.
1.c) Mercury, Venus, Earth, Mars, Jupitar, Saturn, Neptune and Uranas.
1.d) Earth is the only planet in our Solar System that has a large amount of liquid water. Abount 74% of the surface of Earth is covered by liquid or frozen water.
1.e) One side of the moon always faces the Earth because the spinning period of the moon is the same time it takes for the moon to the orbit around the Earth.
1.f) Universe is all of the space and time and their contents including planets, stars and galaxies.
Hope it help you