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 according 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?
( What is the Universe ?
Answers
Answer:
Explanation:
(a) stars have there own light and are very very very bright , they are very big as well and are stationary ( do not move ) whereas planets do not have there own light and thus are not bright , they are relatively much much much smaller in size and revolve around stars.
example of stars - sun , UY Scuti etc
example of planets - earth , mars etc.
(b) a solar system comprises of planets that revolve around a star with there moons or natural satellite and smaller bodies such as comets , asteroids and meteoroids
(c) from nearest to farthest -
mercury , venus , earth . mars , jupiter , saturn , uranus and neptune
(d) earth is called a unique planet as it consists of water , oxygen , soil and the perfect distance from the sun. it also is the only planet till now found to have an atmosphere that supports life.
(e) One revolution of the moon around the earth takes about 27 days. Incidentally, the moon's rotation about its own axis also takes nearly the same time. One day of the moon is equal to 27 Earth days. So only one side of the moon can be seen from the earth.
what is universe ?
universe is expanding every second. it once used to be in a size of an atom ( the smallest particle possible ). then the pressure in inside it made it expand which is still happening. the universe consists of literally everything. it is in the space where there are many more universes. this collection of universes is called multi verse. the universe comprises of white holes , black holes , wormholes , galaxies , solar systems , stars , planets and even we are in the universe
hope this helps you
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