EXERCISES
Answer the following questions briefly.
(a) How does a planet differ from a star?
What is meant by the Solar System'?
(b)
(c)
Name all the planets according to their distance from the sun
ta
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 ?
correct answer.
Answers
Answer:
Planets are very large round celestial bodies in space that moves around the sun or another star whereas stars are ball of fire which shine brightly and can be larger than planets. Dog star is larger than sun.
The solar system is the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
Earth is called unique planet because Earth is the only planet having water and land and so it has life in it.
We can see the same side of the Moon always because the time of rotation and revolution of the Moon is same which in 27.3 days.
The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.