NCERT Solutions for Class 8 Science Chapter Stars and the Solar System 17 - Free PDF Download
1. Which of the following is NOT a member of the solar system?
a) An asteroid
b) A satellite
c) A constellation
d) A comet
Ans: (c) A constellation
A constellation is not a member of the solar system because it is a group of stars forming a definite shape whereas an asteroid, satellite, and comet are a part of the solar system.
2. Which of the following is NOT a planet of the sun?
a) Sirius
b) Mercury
c) Saturn
d) Earth
Ans: (a) Sirius
Sirius is not a planet of the sun but a star. The planets of the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
3. Phases of the moon occur because
a) we can see only that part of the moon that reflects light towards us.
b) our distance from the moon keeps changing.
c) The shadow of the Earth covers only a part of the moon’s surface.
d) The thickness of the moon’s atmosphere is not constant.
Ans: (a) we can see only that part of the moon that reflects light towards us.
Phases of the moon occur because the source of light of the moon is the Sun, it does not have its light and hence, it reflects the light coming from the sun and we can only see that part of the moon that reflects light towards us.
4. Fill in the blanks:
a) The planet which is farthest from the sun is _________.
Ans: The planet which is farthest from the sun is Neptune.
b) The planet which appears reddish in colour is _________.
Ans: The planet which appears reddish in color is Mars.
c) A group of stars that appear to form a pattern in the sky is known as a _________.
Ans: A group of stars that appear to form a pattern in the sky is known as a Constellation.
d) A celestial body that revolves around a planet is known as a _______.
Ans: A celestial body that revolves around a planet is known as a satellite.
e) Shooting stars are actually not _________.
Ans: Shooting stars are actually not stars.
f) Asteroids are found between the orbits of ____ and _____.
Ans: Asteroids are found between the orbits of Mars and Jupiter.
5. Mark the following statement as true (T) or false (F).
a) Pole star is a member of the solar system.
Ans: True
Stars are a member of the solar system.
b) Mercury is the smallest planet in the solar system.
Ans: True
Mercury is the smallest planet and all other planets are larger than mercury.
c) Uranus is the farthest planet in the solar system.
Ans: False
Neptune is the farthest planet in the solar system.
d) INSAT is an artificial satellite.
Ans: True
INSAT is a man-made satellite.
e) There are nine planets in the solar system.
Ans: False
There are eight planets in the solar system. The planets of the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
f) Constellation Orion can be seen only with a telescope.
Ans: False
During winters, the constellation Orion is visible with naked eyes.
6. Match items in column A with one or more items in column B.
Ans: Inner planets are the first four planets closest to the Sun-Mercury, Venus, Earth, and Mars.
Therefore, (i) Inner planets – e) Earth, g) Mars
Outer planets are the last four planets closest to the Sun – Jupiter, Saturn, Uranus, and Neptune
Therefore, (ii) Outer planets – a) Saturn
A constellation is a group of stars forming a definite shape.
Therefore, (iii) Constellation – c) Great Bear, f) Orion
A satellite of the earth is the moon.
Therefore, (iv) Satellite of earth – d) Moon
7. In which part of the sky can you find Venus if it is visible as an evening star?
Ans: The part of the sky where we can find Venus if it is visible as an evening star is the west side of the sky.
8. Name the largest planet of the solar system.
Ans: The largest planet of the solar system is Jupiter and the smallest planet is Mercury.
9. What is a constellation? Name any two constellations.
Ans: A constellation is a group of stars forming a definite shape. The two constellations are:
i) Orion: It is located on the celestial equator and is visible throughout the world. It is a constellation in the night sky.
ii) Great Bear: It is located in the northern sky.
10. Draw sketches to show the relative position of prominent stars in
a) Ursa Major
Ans: Ursa major is located in the northern sky.
The sketch of the Ursa Major is:
b) Orion
Ans: Orion is located on the celestial equator and is visible throughout the world. It is a constellation in the night sky.
The sketch of the Orion is:
(Image Will Be Updated Soon)
11. Name two objects other than planets that are members of the solar system.
Ans: The two other objects other than planets that are members of the solar system are:
i) Stars: Stars are celestial bodies made up of gases; they are huge in size and have very high temperatures
ii) Asteroid: Asteroids are small, rocky objects that orbit the sun.
12. Explain how you can locate the Pole Star with the help of Ursa Major.
Ans: We locate the Pole Star with the help of Ursa Major with the help of the three stars at the end of Ursa Major. To do so, create a straight line passing through the last three stars and extend that line in the north direction. The star seen in that direction is the Pole star.
13. Do all the stars in the sky move? Explain.
Ans: No, the stars in the sky do not move because the Pole star is located above the axis of rotation of the Earth in the north direction. And hence it appears to be stationary and all other stars in the sky appear to move from East to West.
14. Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light-years away from the Earth?
Ans: Stars are very far away from each other and the standard km notation of the distance seems unrealistic to use for denoting the distance between stars and hence, a much convenient and larger unit is used for expressing these distances which are known as light-years. It helps to make calculations and imagination easy.
One light-year denotes the distance traveled by light in one year.
$1\text{ Light Year = 9}\text{.46}\times {{10}^{\text{12}}}\text{ }km$
A star is eight light-years away from the Earth means that a star is $\text{8}\times \text{ 9}\text{.46}\times {{10}^{\text{12}}}=7.568\times {{10}^{\text{13}}}\text{ }km$ away from the Earth.
15. The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accommodate?
Ans: The shape of Earth and Jupiter is a sphere. Let the radius of Earth be ${{R}_{E}}$ and the radius of Jupiter be ${{R}_{J}}$.
Given, ${{R}_{J}}=11\cdot {{R}_{e}}$ …..(1)
We know that the volume of a sphere of the radius $r$ is $\dfrac{4}{3}\pi {{r}^{3}}$. Therefore,
The volume of Earth, ${{V}_{E}}=\dfrac{4}{3}\pi R_{E}^{3}$ …… (2)
The volume of Jupiter, ${{V}_{J}}=\dfrac{4}{3}\pi R_{J}^{3}$
But from (1), ${{R}_{J}}=11\cdot {{R}_{e}}$. Hence, Volume of Jupiter, ${{V}_{J}}={{\left( 11 \right)}^{3}}\dfrac{4}{3}\pi R_{E}^{3}$ ...(3)
From (2) and (3), the ratio of the volumes of Jupiter and the Earth is
$\dfrac{{{V}_{J}}}{{{V}_{E}}}=\dfrac{{{\left( 11 \right)}^{3}}\dfrac{4}{3}\pi R_{E}^{3}}{\dfrac{4}{3}\pi R_{E}^{3}}$
$\Rightarrow \dfrac{{{V}_{J}}}{{{V}_{E}}}={{\left( 11 \right)}^{3}}$
$\therefore \dfrac{{{V}_{J}}}{{{V}_{E}}}=1331$
This means that Jupiter can accommodate $1331$ earth.
16. Boojho made the following sketch of the solar system. Is the sketch correct? If not, correct it.
Ans: The figure of the solar system is incorrect because
a) The positions of Mars and Venus are interchanged.
b) The positions of Uranus and Neptune are interchanged.
c) The asteroid belt which is between Mars and Jupiter should be present between Jupiter and Saturn.
The correct figure is:
NCERT Solutions for Class 8 Science Chapter 17 - Stars and The Solar System
NCERT Solutions Class 8 Chapter 17 is a click away to get explanations to all sorts of problems a student might face when they have an exam or test ahead. These solutions act as a guide for students. NCERT Solutions explain the entire chapter to students in a systematic manner and contribute to making students conceptually strong. With our learning packages, you will study the topics and its concept with more interest and involvement. NCERT Solutions Class 8 Science Chapter 17 come with important points and act as an instrumental tool for students who want to score more marks in the exam.
NCERT Solutions for Class 8 Science Chapter 17
Chapter-17 Stars And The Solar System
In the curriculum of Class 8 Science, Chapter 17 is Stars and the Solar System. Chapter 17 in the Science textbook takes students to outer space and in the universe where they will get to know about different planets in the solar system, celestial objects like the moon, stars, etc., constellations like Orion, the sun, asteroids, meteors, different planets, comets and artificial satellites.
Our highly qualified subject matter experts have prepared these NCERT Solutions for Class 8 Chapter 17 Science in an efficient manner. Through this, they explain the chapter and its concepts with ease. With these NCERT Solutions in hand, cracking the exam is very easy. Our guide also helps to lay a strong foundation for Science fundamentals.
Class 8 Science Chapter-Wise Marks Weightage
Chapter 17 Stars and the Solar System is a part of the Science curriculum. Many questions of the Science section are formed from this chapter. Going through these NCERT Solutions will help the student score better in their exams. The topics covered in the chapter Stars and the Solar System are:
Ex. 17.1 The Moon
Ex. 17.2 The Stars
Ex. 17.3 Constellations
Ex. 17.4 The Solar System
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Preparing from our NCERT Solutions Class 8 is a great way for students to understand the chapter in less time.
These solutions also help in strategy formation for students to excel in exams.
Here, you can read Chapter 17 of Class 8 Science NCERT Book and get important links.
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Students without any hesitation can rely upon these NCERT answers as most of the questions in the CBSE exam are asked from NCERT textbooks.
Important Points
The practice of gathering data from afar using satellites is known as remote sensing.
The Sun is a star because it constantly emits light and heat. It appears larger than other stars because it is closer to Earth.
Mercury, Venus, Earth, Mars, Jupiter, and Saturn were the planets known to ancient astronomers.
Swarms of meteors are seen when the earth passes through the comet's tail, which is known as a meteor shower.
The Sun is a star because it constantly emits light and heat. It appears larger than other stars because it is closer to Earth.
Asteroids are small rock and metal planets that orbit the Sun, mostly between Mars and Jupiter.
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Chapter-wise NCERT Solutions for Class 8 Science
Chapter 17 - Stars and The Solar System
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FAQs on NCERT Solutions for Class 8 Science Chapter 17 - Stars And The Solar System
1. What are some members of the Solar System other than planets and the sun?
There are many bodies other than planets that revolve around the sun. These are:
Asteroids: These are small objects that revolve around the Sun and are present in between the orbits of Mars and Jupiter. Only through large telescopes, these asteroids are visible.
Comets: These are bodies with a small head and a tail. The tail keeps on growing as these comets come near the sun. The tail of the comet is opposite to the sun or away from the sun.
Meteors: Sometimes, some small objects enter the earth's atmosphere. These are also known as shooting stars or Meteors.
2. What are Constellations? What are some major Constellations?
Constellations are a group of stars that forms a specific shape that can be recognized easily. Some common constellations are:
Ursa Major- It is seen during summertime. It is also known by the name the Big Dipper, Saptarishi, or the Great Bear. There are 7 prominent stars in this constellation. It appears like a big ladle.
Orion- This constellation is seen in the winter season in the late evenings. This constellation is also known as Hunter. This constellation has around 7-8 bright stars. The belt of the hunter is formed by 3 stars and the other 4 stars make the quadrilateral.
3. List out the concepts discussed in the Chapter 17 of NCERT Solutions for Class 8 Science.
Chapter 17 of Class 8 NCERT Science deals with space and the various stars present in the solar system. The concepts discussed include luminous and non-luminous objects, the phases of the moon, the rotation of the earth along its axis and its revolution around the sun, along with the formation of various constellations. Planetary bodies are also discussed. To know further about these concepts visit the page NCERT Solutions Class 8 Science Chapter 17 on the Vedantu website or download the Vedantu app to access the resources for free.
4. Is the NCERT Solutions for Class 8 Science Chapter 17 the best reference guide for the students?
NCERT Solutions helps students identify the most commonly asked important questions that may be presented to them during examinations. Thus, these NCERT Solutions act as the best reference guide for students, enabling them to enhance their preparation further and achieve maximum results. Vedantu’s well curated solutions perform the job of explaining the entire chapter to students in a systematic manner and making them conceptually strong.
5. What is the solar system in Chapter 17 of Class 8 Science?
In every unique solar system, the Sun and the celestial bodies which revolve around it form the components of the solar system. Comets, asteroids and meteors are also part and parcel of any solar system. The gravitational attraction between the Sun and these other celestial objects is what keeps them revolving around the sun. Our solar system consists of a centrally placed Sun and 8 planets that revolve around it.
6. What is a Star?
Stars are celestial objects that radiate their own light. The sun is also a star. These stars often are also arranged in the shape of constellations like Orion, Ursa Major, Cassiopeia, and more. An interesting fact is that all the stars appear to revolve around the Pole star. Moreover, the brightest star in the sky is named Sirius and is found near the Orion constellation.
7. Why is the Sun also called Star?
The Sun emits its own light source and produces gases by the process of fusion. This is why it is called a star. Any Sun is the center of its solar system around which planets revolve. In the case of our solar system, the Sun is nearly 150 million km away from the Earth. The next nearest star is Alpha Centauri. It is at a distance of about 4.37 light years from the Earth.