NCERT Solutions for Class 8 Science Stars and the Solar System [Old Book]
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Page 1
NCERT
SOLUTIONS
CLASS - 8TH
aglase .co
SOLUTIONS
CLASS - 8TH
aglase .co
Page 2
Book : Science Ncert Solutions | Chapter-17 Science
Class : 8th
Subject : Science
Chapter : 17
Chapter Name : STARS AND THE SOLAR SYSTEM
Q1 Which of the following is NOT a member of the solar system?
(a) An asteroid
(b) A satellite
(c) A constellation
(d) A comet
Answer. (c) Constellation
A constellation is not a member of the solar system. Constellations are groups of stars
that form recognisable shapes.
Page : 234 , Block name : Exercise
Q2 Which of the following is NOT a planet of the sun?
(a) Sirius
(b) Mercury
(c) Saturn
(d) Earth
Answer. (a) Sirius
Sirius is a star and not a planet of the sun.
Page : 234 , Block name : Exercise
Q3 Phases of the moon occur because
(a) we can see only that part of the moon which re�ects 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.
Answer. (a) Phases of the moon occur because we can see only that part of the moon
which re�ects light towards us.
Moon does not produce its own light. We are able to see the moon because the sunlight
falling on it gets re�ected towards us. Thus, we see only that part of the moon from
which the light of the sun gets re�ected towards us.
Page 1 of 8 Aglasem Schools
Class : 8th
Subject : Science
Chapter : 17
Chapter Name : STARS AND THE SOLAR SYSTEM
Q1 Which of the following is NOT a member of the solar system?
(a) An asteroid
(b) A satellite
(c) A constellation
(d) A comet
Answer. (c) Constellation
A constellation is not a member of the solar system. Constellations are groups of stars
that form recognisable shapes.
Page : 234 , Block name : Exercise
Q2 Which of the following is NOT a planet of the sun?
(a) Sirius
(b) Mercury
(c) Saturn
(d) Earth
Answer. (a) Sirius
Sirius is a star and not a planet of the sun.
Page : 234 , Block name : Exercise
Q3 Phases of the moon occur because
(a) we can see only that part of the moon which re�ects 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.
Answer. (a) Phases of the moon occur because we can see only that part of the moon
which re�ects light towards us.
Moon does not produce its own light. We are able to see the moon because the sunlight
falling on it gets re�ected towards us. Thus, we see only that part of the moon from
which the light of the sun gets re�ected towards us.
Page 1 of 8 Aglasem Schools
Page 3
Book : Science Ncert Solutions | Chapter-17 Science
Q4 Fill in the blanks.
(a) The planet which is farthest from the Sun is ____________ .
(b) The planet which appears reddish in colour is ____________ .
(c) A group of stars that appear to form a pattern in the sky is known as a ____________ .
(d) A celestial body that revolves around a planet is known as __________.
(e) Shooting stars are actually not ____________.
(f) Asteroids are found between the orbits of _________ and _______
Answer. (a) The planet which is farthest from the sun is __Neptune__.
(b) The planet which appears reddish in colour is __Mars__.
(c) 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 satellite_.
(e) Shooting stars are actually not stars __.
(Shooting stars are not stars, they are meteors)
(f) Asteroids are found between the orbits of __Mars __ and __Jupiter.
(Asteroids occupy a large gap between the orbits of Mars and Jupiter)
Q5 Mark the following statements as true (T) or false (F).
(a) Pole star is a member of the solar system. ( )
(b) Mercury is the smallest planet of the solar system. ( )
(c) Uranus is the farthest planet in the solar system. ( )
(d) INSAT is an arti�cial satellite. ( )
(e) There are nine planets in the solar system. ( )
(f) Constellation Orion can be seen only with a telescope. ( )
Answer. (a) False
Stars are not a member of the solar system. The sun and the celestial bodies revolving
around it form the solar system.
(b) True
Mercury is the smallest planet of the solar system.
(c) False
Neptune is the farthest planet in the solar system.
(d) True
INSAT is an arti�cial satellite.
(e) False
Page 2 of 8 Aglasem Schools
Q4 Fill in the blanks.
(a) The planet which is farthest from the Sun is ____________ .
(b) The planet which appears reddish in colour is ____________ .
(c) A group of stars that appear to form a pattern in the sky is known as a ____________ .
(d) A celestial body that revolves around a planet is known as __________.
(e) Shooting stars are actually not ____________.
(f) Asteroids are found between the orbits of _________ and _______
Answer. (a) The planet which is farthest from the sun is __Neptune__.
(b) The planet which appears reddish in colour is __Mars__.
(c) 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 satellite_.
(e) Shooting stars are actually not stars __.
(Shooting stars are not stars, they are meteors)
(f) Asteroids are found between the orbits of __Mars __ and __Jupiter.
(Asteroids occupy a large gap between the orbits of Mars and Jupiter)
Q5 Mark the following statements as true (T) or false (F).
(a) Pole star is a member of the solar system. ( )
(b) Mercury is the smallest planet of the solar system. ( )
(c) Uranus is the farthest planet in the solar system. ( )
(d) INSAT is an arti�cial satellite. ( )
(e) There are nine planets in the solar system. ( )
(f) Constellation Orion can be seen only with a telescope. ( )
Answer. (a) False
Stars are not a member of the solar system. The sun and the celestial bodies revolving
around it form the solar system.
(b) True
Mercury is the smallest planet of the solar system.
(c) False
Neptune is the farthest planet in the solar system.
(d) True
INSAT is an arti�cial satellite.
(e) False
Page 2 of 8 Aglasem Schools
Page 4
Book : Science Ncert Solutions | Chapter-17 Science
There are eight planets in the solar system.
They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
(f) False
Constellation Orion can be seen during winters around late evenings. It is one of the
most magni�cent constellations in the sky, visible to the naked eyes.
Q6 Match items in column A with one or more items in column B.
Answer. (a) - (ii)
(b) - (iii), (vi)
(c) - (i), (v), (vii)
(d) - (iv)
Q7 In which part of the sky can you �nd Venus if it is visible as an evening star?
Answer. Venus appears in the western sky after sunset and is called the evening star.
Q8 Name the largest planet of the solar system.
Answer. The largest planet of the solar system is Jupiter.
Q9 What is a constellation? Name any two constellations.
Answer. A constellation is a group of stars that form a recognisable pattern in the sky.
The two well known constellations are Ursa Major and Orion.
Page 3 of 8 Aglasem Schools
There are eight planets in the solar system.
They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
(f) False
Constellation Orion can be seen during winters around late evenings. It is one of the
most magni�cent constellations in the sky, visible to the naked eyes.
Q6 Match items in column A with one or more items in column B.
Answer. (a) - (ii)
(b) - (iii), (vi)
(c) - (i), (v), (vii)
(d) - (iv)
Q7 In which part of the sky can you �nd Venus if it is visible as an evening star?
Answer. Venus appears in the western sky after sunset and is called the evening star.
Q8 Name the largest planet of the solar system.
Answer. The largest planet of the solar system is Jupiter.
Q9 What is a constellation? Name any two constellations.
Answer. A constellation is a group of stars that form a recognisable pattern in the sky.
The two well known constellations are Ursa Major and Orion.
Page 3 of 8 Aglasem Schools
Page 5
Book : Science Ncert Solutions | Chapter-17 Science
Q10 Draw sketches to show the relative positions of prominent stars in (a) Ursa Major
and (b) Orion
Answer. (a) Ursa Major appears like a big dipper. There are three bright stars in the
handle and four stars in the bowl of the dipper (as shown in the given �gure).
(b) Orion appears like a hunter. Three bright stars appear in the belt, while �ve bright
stars are arranged in the form of a quadrilateral (as shown in the given �gure).
Page 4 of 8 Aglasem Schools
Q10 Draw sketches to show the relative positions of prominent stars in (a) Ursa Major
and (b) Orion
Answer. (a) Ursa Major appears like a big dipper. There are three bright stars in the
handle and four stars in the bowl of the dipper (as shown in the given �gure).
(b) Orion appears like a hunter. Three bright stars appear in the belt, while �ve bright
stars are arranged in the form of a quadrilateral (as shown in the given �gure).
Page 4 of 8 Aglasem Schools
Page 6
Book : Science Ncert Solutions | Chapter-17 Science
Q11 Name two objects other than planets which are members of the solar system.
Answer. (i) Asteroids
A collection of a large number of small objects, gases and dust are revolving around the
sun. They occupy a large gap between the orbits of Mars and Jupiter. However, these are
not planets. These celestial objects are known as asteroids.
(ii) Meteors
Meteors are small celestial objects that are seen as bright streaks of light in the sky.
They brunt out on entering the Earth’s atmosphere because of the heat produced by
friction. This results in bright streaks in the sky. They are not planets.
Q12. Explain how you can locate the Pole Star with the help of Ursa Major.
Answer. In order to locate the Pole star in the sky, �rst of all Ursa Major or Big Dipper
constellation must be located. The bowl of the Big Dipper consists of four bright stars (as
shown in the given �gure).
Consider two stars at the end of this bowl. Now, draw an imaginary straight line towards
the Northern direction connecting these two stars (as shown in the given �gure).
This imaginary line meets a star called the Pole Star. The length of the imaginary line
from the bowl is about �ve times the distance between the two stars of the bowl.
Q13. Do all the stars in the sky move? Explain.
Page 5 of 8 Aglasem Schools
Q11 Name two objects other than planets which are members of the solar system.
Answer. (i) Asteroids
A collection of a large number of small objects, gases and dust are revolving around the
sun. They occupy a large gap between the orbits of Mars and Jupiter. However, these are
not planets. These celestial objects are known as asteroids.
(ii) Meteors
Meteors are small celestial objects that are seen as bright streaks of light in the sky.
They brunt out on entering the Earth’s atmosphere because of the heat produced by
friction. This results in bright streaks in the sky. They are not planets.
Q12. Explain how you can locate the Pole Star with the help of Ursa Major.
Answer. In order to locate the Pole star in the sky, �rst of all Ursa Major or Big Dipper
constellation must be located. The bowl of the Big Dipper consists of four bright stars (as
shown in the given �gure).
Consider two stars at the end of this bowl. Now, draw an imaginary straight line towards
the Northern direction connecting these two stars (as shown in the given �gure).
This imaginary line meets a star called the Pole Star. The length of the imaginary line
from the bowl is about �ve times the distance between the two stars of the bowl.
Q13. Do all the stars in the sky move? Explain.
Page 5 of 8 Aglasem Schools
Page 7
Book : Science Ncert Solutions | Chapter-17 Science
Answer. No. The Earth rotates from West to East on its axis. Hence, all stars in the sky
(except the Pole star) appear to move from East to West. With reference to the Earth, the
Pole star does not appear to move in the sky because it is located above the axis of
rotation of the Earth in the north direction. It appears to remain stationary at a point in
the sky.
Q14. 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?
Answer. The distance of the stars from the Earth and the distance between the stars are
very large. It is inconvenient to express these distances in kilometer (km). Thus, these
large distances are expressed in light years. One light year is the distance travelled by
light in one year. One light year is equal to 9.46 × 1012 km.
A star is located eight light years away from the Earth. This means that the distance
between the star and the Earth is equivalent to the distance travelled by light in eight
years, i.e., a star is located 8 × (9.46 × 1012) = 7.6 × 1013 km away from the Earth.
Q15 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?
Answer. Earth and Jupiter can be considered as two spheres with radii R and R’
respectively. Given that the radius of Jupiter is 11 times the radius of the Earth.
Page 6 of 8 Aglasem Schools
Answer. No. The Earth rotates from West to East on its axis. Hence, all stars in the sky
(except the Pole star) appear to move from East to West. With reference to the Earth, the
Pole star does not appear to move in the sky because it is located above the axis of
rotation of the Earth in the north direction. It appears to remain stationary at a point in
the sky.
Q14. 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?
Answer. The distance of the stars from the Earth and the distance between the stars are
very large. It is inconvenient to express these distances in kilometer (km). Thus, these
large distances are expressed in light years. One light year is the distance travelled by
light in one year. One light year is equal to 9.46 × 1012 km.
A star is located eight light years away from the Earth. This means that the distance
between the star and the Earth is equivalent to the distance travelled by light in eight
years, i.e., a star is located 8 × (9.46 × 1012) = 7.6 × 1013 km away from the Earth.
Q15 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?
Answer. Earth and Jupiter can be considered as two spheres with radii R and R’
respectively. Given that the radius of Jupiter is 11 times the radius of the Earth.
Page 6 of 8 Aglasem Schools
Page 8
Book : Science Ncert Solutions | Chapter-17 Science
Hence, this ratio suggests that Jupiter can accommodate 1331 number of Earths within
it.
Page : 236 , Block name : Exercise
Q16 Boojho made the following sketch (Fig. 17.29) of the solar system. Is the sketch
correct? If not, correct it.
Answer. Planets of the solar system in sequence of their distances from the sun are:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Therefore, Boojho’s
sketch of the solar system is not correct because he has interchanged the positions of
Mars and Venus and also the positions of Uranus and Neptune. Also, he has shown the
Asteroid belt in the gap between the orbits of Jupiter and Saturn. This is not correct. The
asteroid belt is located between the orbits of Mars and Jupiter. The correct sketch of the
solar system is shown in the given �gure.
Page 7 of 8 Aglasem Schools
Hence, this ratio suggests that Jupiter can accommodate 1331 number of Earths within
it.
Page : 236 , Block name : Exercise
Q16 Boojho made the following sketch (Fig. 17.29) of the solar system. Is the sketch
correct? If not, correct it.
Answer. Planets of the solar system in sequence of their distances from the sun are:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Therefore, Boojho’s
sketch of the solar system is not correct because he has interchanged the positions of
Mars and Venus and also the positions of Uranus and Neptune. Also, he has shown the
Asteroid belt in the gap between the orbits of Jupiter and Saturn. This is not correct. The
asteroid belt is located between the orbits of Mars and Jupiter. The correct sketch of the
solar system is shown in the given �gure.
Page 7 of 8 Aglasem Schools
Page 9
Book : Science Ncert Solutions | Chapter-17 Science
Page : 236 , Block name : Exercise
Page 8 of 8 Aglasem Schools
Page : 236 , Block name : Exercise
Page 8 of 8 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 8 |
| Type | Solution |
| Pages | 9 |
| Language | english |
| Updated | 30 Apr 2026 |