Earth in the Solar System - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Points To Remember:
Solar system refers to the family of sun. The sun, the nine planets, the satellites and other celestial bodies such as asteroids and meteoroids forms the solar system
Sun is a huge star made up of extremely hot gases. It provides the pulling force that binds the solar system. It is the ultimate source of heat and light for the solar system.
The tremendous heat of the sun is not felt much by us because despite being the nearest star, the sun is quite far from the Earth. The distance of the sun from the Earth is about 150 million km
Some celestial bodies do not have their own heat and light. They are lit by the light of the stars. Such bodies are called planets.
There are eight planets in our solar system. In order of their distance from the sun, they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto is not a planet but a 'dwarf planet'
The Earth is the third nearest planet from the Sun. It is the fifth largest planet on the basis of size. It is slightly flattened at the poles, that is why, its shape is described as a Geoid. From the outer space, the Earth appears blue because its two-third surface is covered with water. Thus, Earth is also known as a blue planet.
The moon moves around the Earth in about 27 days. The conditions on the moon are not favourable for the existence of life. There is neither water nor air on moon. There are many mountains, plains and depressions on the surface of the moon
Apart from stars, planets and satellites, there are numerous tiny bodies that also move around the sun. These bodies are called asteroids. They are found between the orbits of Mars and Jupiter.
The small pieces of rocks that move around the sun are called meteoroids. Sometimes, these meteoroids come near the Earth and tend to drop upon it
A galaxy is a huge system of billions of stars and clouds of dust and gases. There are millions of such galaxies that make the universe.
