5.Which gases is most predominant in the Sun --- Hydrogen
6.If the Earth had no satellite of its own (i.e, the moon), which phenomena will not occur? --- Spring tide
7.The time taken by the Uranus to revolve round the Sun is approximately --- 84 years
8.The brightest planet as seen from the earth --- Venus
9.The Distance between the Earth and the Sun is greatest during --- Aphelion
10.What is unusual about the rotation of Venus? ---Venus rotates in the opposite direction from most of the planets
11.The Earth's annual circuit round the Sun covers a distance of --- 966 million km
12.The speed per minute at which the Earth revolves arond the Sun is --- More than 1,600 km
13.The Sun shines vertically on the Equator --- Twice a year
14.The three planets,farthest from the Sun in the ascending order of distance are --- Uranus,Neptune,Pluto
15.The maximum possible angle between the direction of Sun and that of a planet (as viewed from the Earth) is called ---Maximum angular separation
16.A light year, as a unit of measurement of distances of heavenly bodies, is equal to --- 9.5million,million km
17.The planet Neptune, discovered in 1846 and yet to complete its circuit, will be back at the position where it was first observed until the year --- 2011
18.The planet Pluto's orbit around the Sun takes about --- 248 years
19.The biggest star in our galaxy is --- Proxima Centauri
20.The nearest star to Earth (excepting the Sun) in our galaxy is --- Proxima Centauri
21.Who was the first to observe Sun sports ? --- Galileo
22.What are Sunspots ? --- These are cooler areas which move about on the Sun's surface and show up as dark spots
23.Which planet takes very nearly the same time for a rotation on its own axis as does the Earth ? --- Mars
24.Which comet appears every every 76 years --- Halley's
25.The largest number of natural satellites (or moons) that anyone of the planets of the Solar System has is --- 17
26.How many times is the Sun bigger in size than the Earth ? --- 109 times
27.How many times is the Sun heavier than the Earth ? --- 3,30,000 times
28.How much of the surface of the Moon is visible from the Earth ? --- Above 59%
29.The South Pole experiences continuous light at the time of --- Winter Solstice
30.What is the centre of the Solar System --- Sun
31.The path in which planets orbit around the Sun is called --- Ellipse
32.How many days does the Moon take to return to the same position among the constellations ? --- 28 days
33.Which planet takes the shortest time to revolve around the sun? How many Earth days does it take to complete one revolution? --- Mercury takes about 88 Earth days to revolve around the sun once.
34.Which planet takes the longest time to revolve around the sun? How many Earth years does it take to complete one revolution? --- Pluto takes about 248 Earth years to revolve around the sun once.
35.Why is it very difficult to observe the planet Mercury most of the time ? --- The glare of the Sun usually keeps it hidden, it being too close to the Sun
36.Name the two planets which appear as 'morning star' in the eastern sky and 'evening star' in the western sky --- Mercury and Venus
37.Name the two planets laying between the Sun and the Earth --- Mercury and Venus
38.Who was the first to determine that the day on the Mars was,like ours,roughly twenty-four hours long ? --- Giordano Bruno
39.How long does a Sun ray take to travel from the Sun to the Earth ? --- 500 seconds
40.On the day the Sun is nearest the Earth, the Earth is said to be in --- Perihelion
41.What is the significance of te time-period 26,000 years in relation to the Earth ? --- It represents the time-period needed for conical movement of the Earth's axis around a line joining the ecliptic poles for one complete round
42.Johannes Kepler gave to posterity three laws of planetary motions, which he would not have been able to do without astronomical observations. Whose observations did he make use of ? --- Tycho Brahe
43.The study of motion of which planet around the Sun led Johannes Kepler to formulate his three laws about planetary motions ? --- Mars
44."Galileo Satellites" named after their discoverer,are four large moons of the planet --- Jupiter
45.Who is regarded as the first astrophysicist --- Johannes Kepler
46.Who was the first to speculate that Venus is completely covered with clouds ? ---Christian Huygens
47.The stars flare up to greatly increased brightness and fade away after a short time --- Temporary Stars
48.Titan,the largest moon in the Solar System,is also the largest moon of --- Uranus
49.What name is given to the path of the Sun amongst the stars in our galaxy ? --- Ecliptic
50.The visible part of the Sun is called --- Photosphere
51.When and by whom were the rings of Saturn discovered ? --- Galileo; 1610
52.The biggest planet --- Jupiter
53.Farthest Planet from the sun --- Pluto
54.The temperatures at the surface of the Sun and its centre are, respectively,about --- 6000 K and 20 million K
55.The Sun consists mostly of --- Hydrogen
56.The number of constellations in the Milky Way Galaxy is --- 12
57.Who wrote the book "The Harmonies of the World" ? --- Johannes Kepler
57.What will happen if the Earth were to stop its rotatory motion on its axis ? --- There will be no day and night as at present
58.The Sun is a mass of hot gases
59.Nebular hypothesis is a theory about the origin of the --- Solar System
60.Why does the Moon always keep roughly the same face turned towards us ? --- Because it rotates on its axis in about the same time as it takes to go round the Earth
61.The Earth revolves around the Sun at a speed of --- 29.7 km/sec
62.Who was the first to measure the distance round the Earth ? --- Eratosthenes
63.Who invented the principle of reflecting telescope, which is now used as the world's largest optical telescope? --- Isaac Newton
64.The first planet to be discovered with a telescope was --- Uranus
65.Which planet was for the first time observed in 1930 --- Pluto