Q46 of 112 Page 336

What is meant by 'celestial objects'? Name any three celestial objects.

The stars, the planets, the moon and many other objects in the sky are called celestial objects. The moon is the brightest object in the night sky. Stars are celestial bodies that emit light of their own. Our sun is also a star. Moon is the natural satellite of the Earth. The Sun and the celestial bodies which revolve around it form the solar system. These celestial bodies include the planets, comets, asteroids and meteors.


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44

State whether the following statements are true or false:

(a) Constellation Orion can be seen only with a telescope.


(b) Pole Star is a member of the Solar System.


(c) Mercury is the smallest planet of the Solar System.


(d) Uranus is the farthest planet in the Solar System.


(e) There are nine planets in the Solar System.


(f) Comets are members of the Solar System.


(g) INSAT is an artificial satellite.

 45

Fill in the following blanks with suitable words:

(a) The stars appear to...............in the sky.


(b) The Sun is a.............whereas Orion is a ...............


(c) The group of stars that appears to form a recognizable pattern in the sky is known as.............


(d) The brightest star in the night sky is...............


(e) Ursa Major constellation appears to revolve around the ..............star in the night sky.


(f) Orion constellation can be used to locate the position of ..............star whereas Ursa Major constellation can be used to locate the ...................star in the night sky.


(g) The planet which is farthest from the Sun is............


(h) The planet which appears reddish in colour is.............


(i) The small heavenly bodies revolving around the Sun between the orbits of Mars and Jupiter are called ….


(j) Asteroids are found between the orbits of ............and............


(k) Shooting stars are actually not..............


(l) A celestial body that revolves around a planet is known as.........


(m) A meteoroid becomes a............on entering Earth's atmosphere.


(n) The long-distance transmission of television programmes has been made possible with the help of .......... satellites.

 47

What is a star? Name the star nearest to the Earth.

 48

Why does Pole Star appear to be stationary in the sky?