1.
Option A
2.
A Satellite is a celestial body that moves around the planets in the same way as Planets move around the Sun.
3.
Option A
4.
Option B
5.
From the outer space, the Earth appears blue because its two-thirds surface is covered by water. It is, therefore, called a Blue Planet.
6.
The Moon does not have the conditions favourable for Life as it has neither water nor air. It only has mountains, plains and depressions on its surface.
7.
Apart from the Stars, Planets and Satellites, there are numerous tiny bodies which also move around the Sun. These bodies are called Asteroids. They are found between the orbits of Mars and Jupiter.
8.
It is an artificial body designed by Scientists to gather information about the Universe or for communication. It is carried by a rocket and placed in the orbit around the sun. Some of the Indian satellites in space are - INSAT, IRS, EDUSAT etc.
9.
The Moon moves around the Earth in about 27 days. It takes exactly the same time to complete one spin. As a result, only one side of the Moon is visible to us on the Earth.
10.
Option D
11.
The small pieces of rocks which move around the Sun are called Meteoroids.
12.
Natural Satellite - The Moon. It revolves around the Earth.
Human-made Satellite - INSAT, IRS.
13.
Option B
14.
Option A
15.
A Galaxy is a huge system of billions of Stars and clouds of dust and gases. There are millions of such galaxies which make the Universe.
16.
Because the bright light of the Sun doesn't allow us to see these Objects of the Sky.
17.
Option B
18.
Various patterns formed by different groups of Stars are called Constellations. Example - Ursa Major or Big Bear.
19.
All the eight Planets of the Solar System move around the Sun in fixed paths. These paths are elongated in appearance and are called Orbits.
20.
Option C
