The Universe - Standard 6 - General Science - Balbharati

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 16. The Universe 

Exercise

Q. 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 (rotates east to west)

(h) A celestial body that carries a tail along – Comet


Q. 2 Fill in the blanks.

(a) The group of galaxies of which our Milky Way is a part is called the 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.


Q. 3 Say whether right or wrong. Correct the wrong statements.

(a) Venus is the planet closest to the sun. — Wrong

Correct statement: Mercury is the planet closest to the sun.

(b) Mercury is called a stormy planet. — Wrong

Correct statement: Jupiter is called the stormy planet.

(c) Jupiter is the biggest planet. — Right


Q. 4 Answer the following.

(a) What is a special characteristic of the planet Mars?

Ans. Mars has soil that contains iron, giving it a reddish colour, so it is called the Red Planet. The highest and longest mountain in the solar system, Olympus Mons, is located on Mars.

(b) What are the types of galaxies?

Ans. The main types of galaxies are: Spiral, Elliptical, Barred Spiral, and Irregular galaxies.

(c) Which celestial bodies does a galaxy include?

Ans. A galaxy includes innumerable stars, their planetary systems, nebulae, clusters of stars, clouds of gases and dust, dead stars, new stars, and other celestial bodies.

(d) Name the different types of stars.

The types of stars are:

  1. Sun-like stars
  2. Red Giants
  3. Supernova
  4. Binary or Twin Stars
  5. Variable Stars

(e) What are the types of comets and on what basis are they classified?

Comets are of two types:

  1. Long-period comets – take more than 200 years to revolve around the sun.
  2. Short-period comets – take less than 200 years to revolve around the sun.

They are classified on the basis of their period of revolution around the sun.

(f) What is the difference between meteors and meteorites?

Meteors are rocky pieces that burn up due to friction when they enter the Earth's atmosphere and produce a streak of light (falling star). Meteorites are the parts of meteors that do not burn completely and reach the Earth's surface.

(g) What are the characteristics of the planet Neptune?

Neptune is the eighth planet. Winds on Neptune blow at extremely high speeds. A season on Neptune lasts for about 41 years because of its long revolution period (164 years).


Q. 5 Match the following.

Group A Group B
(1) Galaxy (c) Spiral
(2) Comet (e) Halley
(3) Sun-like star (d) Sirius
(4) Saturn (b) 33 satellites
(5) Venus (a) From east to west

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