NCERT Solutions for Class 6 Social science Chapter 1 The Earth In The Solar System are provided here with simple step-by-step explanations. These solutions for The Earth In The Solar System are extremely popular among class 6 students for Social science The Earth In The Solar System Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the NCERT Book of class 6 Social science Chapter 1 are provided here for you for free. You will also love the ad-free experience on Meritnation’s NCERT Solutions. All NCERT Solutions for class 6 Social science are prepared by experts and are 100% accurate.
Page No 7:
Question A.1:
Whate are celestial bodies?
Answer:
All the objects that we see in the sky are called celestial bodies or heavenly bodies.âThese celestial bodies include stars, planets, satellites, asteroids, meteorids andcomets.The celestial bodies that do not have their own light and heat arecalled planets.âOn the other hand, stars are the celestial bodies that are made up of gases and have their own heat andlight, which they emit in large amounts.
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Question A.2:
To which galaxy does our solar system belong?
Answer:
The Milky Way is the galaxy that contains our solar system. It is also known as Akash Ganga. The word'milky' signifies abright band of light in the night sky where it is almost impossible to distinguish between stars. Akash Gangacan be seen as a faint band of light in a clear night sky.
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Question A.3:
What does the solar system consist of?
Answer:
The solar system consists of the Sun,eight planets, satellites andothercelestial bodies known as asteroids and meteoroids. We often call it a solar family, with the Sun as its head.All the planets and celestial bodies revolve around the Sun in their respective orbits and, in turn, get influenced by the gravitational pull and heat of the Sun.
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Question A.4:
Write the names of the eight planets in order of their distances from the sun.
Answer:
| Name | Distance from the Sun (In Million Kilometres) |
| Mercury | 58 |
| Venus | 108 |
| Earth | 150 |
| Mars | 228 |
| Jupiter | 778 |
| Saturn | 1427 |
| Uranus | 2870 |
| Neptune | 4497 |
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Question A.5:
Which are the two types of movement of the planets?
Answer:
Planets have two types of movement:rotation and revolution.
1. Rotationisthe movement caused when a planet rotates on its axis; for example, theEarth rotates from west to east on its axis.
2. Revolution is the movement when a planet revolves around the Sun in a fixed path. The path of revolution of each planet is either egg-shaped or elliptical; this path is known as an orbit.
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Question A.6:
What are the favourable conditions that make life possible on earth?
Answer:
The Earth is the only planet where conditions are favourable to support life. It is neither too hotnor too cold and thus have an optimum temperature to supporthuman existence. It has water and air, which very muchessentialforthe survival of humans. The air is composed of life-supportinggases like oxygen, carbon dioxide and ozone. Because ofthesefactors, the Earthis regarded as aunique planet ofour solar system.
Page No 7:
Question A.7:
What are asteroids? Where are they found?
Answer:
âApart from stars, planets and satellites, there areseveral other tiny bodies thatmove around the Sun. These bodies are known as asteroids. They are foundbetween the orbits of Mars and Jupiter.The largest known asteroid is named Ceres.
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Question A.8:
What are periodical comets? Give an example.
Answer:
Periodical comets are the comets thatorbit around the Sun and return to the innermost pointof their orbits after a regular interval of time. A good example of a periodical comet is Halley's Comet,which returns to its original position after 7576 years.
Page No 7:
Question B.1:
Star and planet
Answer:
| âStars | Planets |
| Stars are celestial bodies made up of gases; they are huge in size and have very high temperatures. | Planets are the celestial bodies that do not have their own heatand light. |
| They have their own heat andlight, which they emit in large amounts. | They are lit by the light of stars. |
| For example, the Sun is a star.â | For example, the Earth on which we live is a planet. |
Page No 7:
Question B.2:
Planet and satellite
Answer:
| Planets | Satellites |
| These are celestial bodies that do not have their own heat and light; they lit by the light of stars. | Satellites are celestialbodies that move around planets in the sameway planets movearound the Sun. |
| They are made up of solid materials and gases. | They do not have their own light. |
| For example, the Earth is a planet. | For example,the Moon is a natural satellite of the Earth. |
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Question B.3:
Comet and meteor
Answer:
| Comets | Meteors |
| Comets are heavenly bodies that revolve around the Sun in an elongated orbit. | Meteoroids are small rock pieces that revolve around the Sun. |
| They are usually made up of dust, ice particles and gases. | Some meteoroids enter the Earth's atmosphere with a great velocity. |
| Most comets have a head, a nucleus and a tail. When they approach the Sun, the gases get heated up; as a result they glow. | They get heated up due to the friction of the atmosphere. This causes the meteoroids to glow. |
| Example:Halley | Example:Leonid |
Page No 7:
Question C.1:
Mercury is the hottest planet while Neptune is the coldest.
Answer:
Mercury is the hottest planet because it is nearest to the Sun and stands at a distance of 58 million kilometres from the Sun. Hence, Mercury receives the maximum amount of sunlight. â
On the other hand, Neptune is the coldest planet because it is farthest from the Sun and stands at a distance of 4,497 million kilometresfrom the Sun. Hence, Neptune receives the least amount of sunlight among all planets in our solar system.
Page No 7:
Question C.2:
We always see the same side of the moon.
Answer:
The Moon takes 27 days and 8 hours to revolve around the Earth. Thisperiod coincides with the rotation period of the Earth on its axis, i.e. 24 hours. This is the reason we always see the same side of the Moon.
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Question C.3:
There is no possibility of life on the moon.
Answer:
There is no possibility of life on the Moon because of the absenceof the essentials of life on it, i.e. air andwater. Also, there is noatmosphere around it, due to whichdays are very hot and nights are very cold. Thismakesthe conditions unfavourable for the existence of life on the Moon.
Page No 7:
Question D.1:
The temperature of the surface of the sun is about
a. 5,000°C
b. 5,500°C
c. 6,000°C
d. 6,500°C
Answer:
The correct answer is option (c).
Explanation: TheSun is composed of extremelyhot and burning gases like helium and hydrogen. The fusion of hydrogen molecules intohelium molecules results in the release of a huge amount of energy and heat thatraisethe temperature of the Sun up to6,000 degree Centigrade.
Page No 7:
Question D.2:
Which of the following planets has a reddish appearance?
a. Venus
b. Mars
c. Jupiter
d. Saturn
Answer:
The correct answer is option(b).
Explanation: Mars has a reddish appearance because of the presence of iron oxides. Mars is generally referred to as the Red Planet of our solar system.
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Question D.3:
Which of the following planets rotates in a clockwise direction?
a. Mercury
b. Venus
c. Jupiter
d. Neptune
Answer:
The correct answer is optionâ (b).
Explanation:Venus is the only planet in our solar system that rotates clockwise. All other planets rotate anticlockwise.
Page No 8:
Question D.4:
Halley's Comet appears after every
a. 70 years
b. 72 years
c. 74 years
d. 76 years
Answer:
The correct answer is optionâ (d).
Explanation: Halley's Comet appears after a regular interval of 76 years. It last appeared in the solar system in 1986.
Page No 8:
Question E.1:
All heavenly bodies are called cerebral bodies.
Answer:
All heavenly bodies are called celestial bodies.
Explanation: Celestial bodies are the bodies that are found in the universe. These includeplanets, satellites, meteors and meteoroids.
Page No 8:
Question E.2:
The light of the sun takes about eight seconds to reach the earth.
Answer:
The light of the Sun takes about eight minutes to reach the Earth.
Explanation: Since the Earth is very far from the Sun, it takes light around eight minutes to reach the Earth's surface.
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Question E.3:
The star nearest to the sun is Ceres.
Answer:
The star nearest to the sun isProxima Centauri.
Explanation:â TheSun is the nearest star to the Earth, butProximaCentauriis the second nearest star to the Earth and the nearest star to the Sun.
Page No 8:
Question E.4:
Moon is not the satellite of earth.
Answer:
The Moon is the only natural satellite of the Earth.
Explanation: Satellites are the bodies that revolve around planets. The Moon is the only natural satellite of our planet Earth.
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Question F.1:
The largest planet in the solar system. __________
Answer:
The largest planet in our solar system isJupiter.
Explanation: The mass of Jupiter is almost 300 times that of Earth. The diameter of Jupiter is 11 times that of Earth. It is the largest planet of our solar system.
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Question F.2:
The path taken by the planets to go around the sun. ____________
Answer:
The path taken by the planets to go around the Sun is known as theorbit.
Explanation: The path of revolution of each planet around the Sun is either egg-shaped or elliptical. This path is known as the orbit.
Page No 8:
Question F.3:
The first man in space. ____________
Answer:
The first man to visit space was Yuri Alekseyevich Gagarin.
Explanation: YuriAlekseyevichGagarin was the Russian Soviet cosmonaut who travelled in the outer space in the spacecraftVostokin 1961.
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Question F.4:
The planet with a system of rings. ____________
Answer:
The planet with a notable system of rings is Saturn.
Explanation:â Large and colourful rings form theorbiting disc of Saturn. Apart from Saturn, there are other planets that possess planetary rings. These areJupiter, Uranus and Neptune, but their rings have less visibility and theyare not very prominent.
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Question F.5:
The number of planets that rotate in a clockwise direction. ____________
Answer:
There are two planets that rotate clockwise:Venus and Uranus.
Explanation:â Except Venus and Uranus, all planets in our solar system rotate anticlockwise.
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Question F.6:
Mercury, Venus, Earth and Mars are collectively called this. ____________
Answer:
Mercury, Venus, Earth and Mars are collectively known as inner planets in our solar system.
Explanation: They are named inner planets because they are the nearest to the sun. There is huge difference in planetary conditions of these planets and the rest of the planets of our solar system.
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Question F.7:
The largest asteroid. ____________
Answer:
The largest asteroid known isVesta.
Explanation:Though Ceres is way larger in mass than any other asteroid, since it has been listed among dwarf planets, the largest asteroid isVesta.
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Question F.8:
The fictitious planet where Superman came from. ____________
Answer:
Krypton is a fictitious planet of the DC Universe from where the fictitious character Superman has come.
Page No 8:
Question G:
Diagram of the solar system.
Answer:
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