Maharashtra Board Class 6 Science Solution Chapter 16 – The Universe
Balbharati Maharashtra Board Class 6 Science Solution Chapter 16: The Universe. Marathi or English Medium Students of Class 6 get here The Universe full Exercise Solution.
|Maharashtra Class 6|
1.) Name these –
a.) Birth place of stars – Nebula
b.) Biggest planet in the solar system – Jupiter
c.) The galaxy which is our neighbour – Andromeda
d.) Brightest planet in the solar system – Venus
e.) Planet with largest number of satellites – Jupiter
f.) Planets without a single satellite – Mercury and Venus
g.) Planet with a rotation different from other planets –Venus and Uranus
h.) A celestial body that carries a tail along – Comets
2.) Fill in the blanks.
a.) The group of galaxies of which our Milky Way is a part is called Local Group.
b.) Comets are made of ice and dust particles.
c.) The planet Uranus appears as if it is rolling along its orbit.
d.) Jupiter is a stormy planet.
e.) The Pole Star is the best example of a variable type of star.
3.) Say if the statements given below are right or wrong. Rewrite the statements after correcting them.
a.) Venus is the planet closest to the sun.
This statement is wrong.
Mercury is not only the closest planet to the sun but it is also the smallest planet in the solar system.
b.) Mercury is called a stormy planet.
This statement is wrong.
Jupiter is known as a stormy planet. As Jupiter is the largest planet of the solar system, so it can accommodate around 1397 planets whose size is almost equal to that of the earth. In spite of its huge size, it rotates around itself with an immense speed. As there are frequent occurrence of huge storms on it, for this reason it is known as the stormy planet.
c.) Jupiter is the biggest planet.
This statement is right.
Jupiter is one of the largest planet in our solar system.
4.) Answer the following.
a.) What is a special characteristic of the planet Mars?
Mars constitutes the fourth planet of the solar system. The unique feature of Mars is that it is reddish in colour because of the existence of iron in its soil . Consequently, Mars is known as the red planet. Olympus Mons is situated on Mars, which is the greatest and topmost mountain in the solar system.
b.) What are the types of galaxies?
Spiral, Elliptical, Barred spiral and Irregular are the different types of galaxies which can be identified in accordance with their shapes.
1.) Spiral galaxy – Spiral galaxy constitutes those spiral constructions that expands from the central position into the disc. It comprises of dust, gas and stars which are in the protruding part at the interior and in the expanding spiral arms.
2.) Elliptical galaxy – Elliptical galaxy is a kind of galaxy, that depicts an ellipsoidal shape. It is comprised of not only stars but also dust and gas.
3.) Irregular galaxies – Irregular galaxies does not possess a definite uniform shape.
4.) Barred spiral galaxies – Barred spiral galaxies constitutes those spiral galaxies, that are mostly comprised of stars and which depicts a medial bar- like structure.
c.) Which celestial bodies does a galaxy include?
A galaxy is comprised of numerous stars and planetary structures. It includes several celestial bodies, as for instance, stars, sun, comet , meteor, nebulae , dusts and a mass of gases. Our solar system is included in the Milky Way, which constitutes the galaxy. Planets, asteroids and satellites are also included in a galaxy.
d.) Name the different types of stars.
Sun – like stars, Red Giants , Super Nova , Binary or Twin stars and Variable stars are the different types of stars.
1.) Sun – like stars – Though these stars are moderately larger or smaller than the sun but there are numerous variations with regard to their temperatures. Sirius and Alpha Centauri are two such examples.
2.) Red Giants – There is a variation in the temperature of the stars that usually falls between 3000 °C and 4000°C but their brightness is fairly high in comparison to the sun. They are generally reddish in colour and their diameter is 10 to 100 times when compared to that of the sun.
3.) Super – Nova – These stars are quite bigger and greater in comparison to the red giants. The temperature of these stars varies between 3000° C and 4000°C but their diameter is usually greater than the sun.
4.) Binary or Twin stars – Binary stars constitutes more than half of the stars in the sky. They are comprised of two stars that rotates around one another. Sometimes, there are also certain location of three or four stars that rotates around one another.
5.) Variable stars –The shape and brightness of these stars does not depict a proper stability. They are always in a constant mode of contraction or expansion. It radiates less energy, when there is an expansion of star and so as a result of which, their brightness reduces. On contrary, it’s surface temperature enhances, when there is a contraction of star and consequently , the star radiates more energy and portrays a brighter appearance. Polaris is one of the perfect example of variable stars.
e.) What are the types of comets and on what basis are they classified?
A comet is a celestial sphere that rotates around the sun. Comets are mainly composed of ice and dust particles. They constitutes the part of the solar system. From ancient times, the appearance of a comet has been regarded as an unpropitious occurrence. When they are distant from the sun, they appear as points. But, when they are near the sun, their visibility is easily recognized due to the limited distance and the heat of the sun.Their appearance in the sky is extremely scarce because of their lengthy elliptical orbits. After a prolonged duration of time, they reappear in the sky.
Comets can be categorized into two major groups on the basis of the total duration that are taken by the them for the purpose of completing one revolution around the sun.
1.) Long period comets – More than 200 years are taken by these comets in order to complete one revolution around the sun.
2.) Short period comets – Less than 200 years are taken by these comets for the purpose of completing one revolution around the sun.
f.) What is the difference between meteors and meteorites?
The difference between meteors and meteorites.
Meteors are rocky particles that stems from the asteroid belt. Due to the friction with air , theserocky particles get’s burnt in a complete manner, after their entrance to the earth’s atmosphere. Meteors are also called shooting stars.
At times , the meteors do not burn in a complete manner, so as a result of which they fall to the Earth’s surface. These are known as the meteorites. It was presumed that, due to the effect of such a meteorite, there was a formation of the Lonar lake in Maharashtra.
g.) What are the characteristics of the planet Neptune ?
Neptune constitutes the eighth planet of the solar system. The special characteristics of Neptune is that it’s season continues for a period of about 41 years. Wind blows at an immensely great speed on this planet.
5.) Match the following.
Group ‘A’ Group ‘B’
1.) Galaxy a. From east to west
2.) Comet b. 33 satellites
3.) Sun – like star c. Spiral
4.) Saturn d. Sirius
5.) Venus e. Halley
Group ‘A’ Group’B’
1.) Galaxy Spiral
2.) Comet Halley
3.) Sun – like structure Sirius
4.) Saturn 33 satellites
5.) Venus From east to west