Ans. It is a cluster of millions of stars. This band is the Milky Way galaxy. Our solar system is a part of this galaxy.
Ans. 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.
Ans. 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.
Ans. The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids form the solar system. We often call it a solar family, with the sun as its Head.
Ans. Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. The sun is a star.
Ans. 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.
Ans. Difference between a planet and a star
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. Example : Earth
Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. Example : Sun
Ans. Conditions favourable to support life are probably found only on the earth. The earth is neither too hot nor too cold. It has water and air, which are very essential for our survival. The air has life-supporting gases like oxygen. Because of these reasons, the earth is a unique planet in the solar system.
Ans. The sun is the ultimate source of heat and light for the solar system. But that tremendous heat is not felt so much by us because despite being our nearest star, it is far away from us. The sun is about 150 million km away from the earth.
Ans. The sun is in the centre of the solar system. It is huge and made up of extremely hot gases. It provides the pulling force that binds the solar system. The sun is the ultimate source of heat and light for the solar system.
Ans. Sometimes these meteoroids come near the earth and tend to drop upon it. During this process due to friction with the air they get heated up and burn. It causes a flash of light. Sometimes, a meteor without being completely burnt, falls on the earth and creates a hollow.
Ans. A Human-made Satellite is an artificial body. It is 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 earth. Some of the Indian satellites in space are INSAT, IRS, EDUSAT, etc.
Ans. Mercury - One orbit around sun - 88 days
One spin on axis - 59 days
Venus - One orbit around sun - 255 days
One spin on axis - 243 days
Earth - One orbit around sun - 365 days
One spin on axis - 1 day
Number of moons – 1
Mars - One orbit around sun - 687 days
One spin on axis - 1 day
Number of moons – 02
Jupiter - One orbit around sun - 11 years, 11 months about 12 years
One spin on axis - 9 hours, 56 minutes
Number of moons – 16
Saturn - One orbit around sun - 29 years, 5 months
One spin on axis - 10 hours 40 minutes
Number of moons - about 18
Uranus - One orbit around sun - 84 years
One spin around axis - 17 hours 14 minutes
Number of moons - about 17
Neptune - One orbit around sun - 164 years
One spin on axis-16 hours 7 minutes
Number of moons - 8
Download to practice offline.