Lakhmir Singh and Manjit Kaur Science solution: Stars And The Solar System Chapter 17. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 17 . Here we give Chapter 17 all solution of Class 8. Its help you to complete your homework.
- Board – CBSE
- Text Book – SCIENCE
- Class – 8
- Chapter – 17
VERY SHORT ANSWER TYPE QUESTIONS :
(1.) Moon, stars.
(2.) Pole stars.
(3.) Pole stars.
(4.) light year.
(5.) kilometer is not a suitable to express the distance between the stars and planets so its expressed by Light year.
(6.) Its means the distance between our earth to the star is 8 light years.
(7.) Ursa major constellation.
(10.) Big bear, Big dipper.
(11.) a> Summer. b> Winter.
(15.) because it is close to the earth than the other planets.
(19.) Mercury, Venus.
(21.) (a) Mercury, (b) Neptune
(22.) Uranus, Neptune.
(24.) Mercury, Venus.
(26.) Red of mars.
(29.) Colorful ring.
(31.) Asteroids, Meteor.
(32.) Mars and Jupiter.
(33.) Meteoroids, Meteor.
(36.) Comet and asteroids because it is not a planet and also don’t orbit sun.
(37.) Moon, Aryabhatta.
(40.) Updated Shortly
(41.) Indian national satellite system.
(42.) Indian remote sensing satellite.
(43.) a> Cassiopeia, b> Leo Major.
(44) (a)- False (b) False (c) True (d) False (e) False (f) True (g) True
(45) (a) twinkle (b) star, constellation (c) constellation (d) Sirius (e) Pole (f) Sirius, Pole (g) Neptune (h) Mars (i) asteroids (j) Mars; Jupiter (k) stars (l) satellite (m) meteor (n) artificial
SHORT ANSWER TYPE QUESTIONS
(46.) A natural object which are located outside the earth’s atmosphere is called celestial object.
(47.) Star is a huge glowing ball of gas mainly with hydrogen and helium.
Sun is the nearest sun to the earth.
(48.) Pole star is located above the north pole and the earth revolve on its axis passing through the poles that’s why pole stars looks stationary because of its location.
(49.) The stars are so much farther away than any distance you can move on the Earth, so all the stars do not move in the sky.
(50.) The group of stars which appears to form some recognizable shape or pattern is known as a constellation.
(51.) a> 8 minutes. B> 4.3 years.
(52.) Solar system consists of the sun, the eight planets and their satellites and millions of smaller celestial objects such as asteroids, comets etc.
(53.) Planets are the large celestial objects which revolve around the sun is closed elliptical paths called orbits.
(54.) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
(55.) Venus, Mercury are the inner planets.
Jupiter, Saturn are the outer planets.
(56.) Mercury is always hidden by the sun glare that’s why mercury is difficult to observe.
(57.) Update Shortly.
(58.) Distance of the earth from the sun, Size of the earth, Oxygen, light, water.
(60.) A satellite is a celestial body that revolves around a planet.
Moon is the natural satellite of the earth.
(61.) Moon is the lighted up by the sun.
(63.) Asteroids are small celestial objects which revolve around the sun between the orbits of mars and Jupiter.
(64.) Natural satellites are made by nature but artificial sun is made by human.
(65.) A man-made space craft placed in orbit around the earth is called an artificial satellite.
(66.) Five uses of artificial satellite :
- Used for communication such as long distance transmission of television programmes.
- Used for weather forecasting.
- Used for natural surveying the natural resource.
- Used for spying for military purpose.
- Used for collect information about another planet.
(67.) Light year is the distance travelled by light in one year.
1 light year = 9.46 × 1012 Kilometers.
(68.) Comer are very small celestial objects made of gas and dust which revolve around the sun in highly elliptical orbits.
(69.) Comet become visible when they come close to the sun.
(70.) The tail of the comet become glow because of sun.
(71.) Meteors are the celestial bodies from the sky which we see as a bright streak of light that flashes for a moment across the sky.
The other name of the meteor are shooting stars.
(72.) The difference is a star has its own light but a shooting star has no light of its own.
(73.) Meteoroids are celestial objects which range in size from tiny sand to big boulders of several hundred tones.
(74.) Meteoroids are much smaller than asteroids and comets.
LONG ANSWER TYPE QUESTIONS :
(76.) a> The number of prominent stars in the Ursa Major is 7.
(77.) The number of prominent stars in the orion is 7.
(78.) (a) The number of the main stars in Cassiopeia constellation is 5.
(b) The number of the main stars in Leo Major is 4.
(79.) (a) We can locate the pole star with 7 bright stars with the help of Ursa Major constellation.
(b) Sirius star is the brightest star in the orion constellation so we can find easily Sirius star with his brightness.
(80.) (a) The difference is : In the full moon we can see the bright disk of moon from the earth but, In the new moon we cannot see the moon from the earth.
(b) Moon revolves around the Earth once every month and moves around the sun along with Earth, different amounts of its sun-lit surface are turned towards the Earth.