The comet, named after Edmund Halley, reappears after a time interval of every _____.

1. 1. 40 years
   2. 76 years
   3. 116 years
   4. 120 years

How long does a sun-ray take to travel form the sun t the earth?

1. 1. 300 sec
   2. 450 sec
   3. 498 sec
   4. 500 sec

Who was the first to determine that the day on the Mars was, like ours, roughly twenty-four hours long?

1. 1. Giordano Bruno
   2. Christians Huygens
   3. Copernicus
   4. Isaac Newton

Who was the first to speculate that Venus is completely covered with clouds?

1. 1. Copernicus
   2. Descartes
   3. Giordano Bruno
   4. Christian Huygens

Titan, the largest moon in the solar system, is also the largest moon of _____.

1. 1. Saturn
   2. Jupiter
   3. Mars
   4. Uranus

“Galileo Satellites”, named after their discoverer, are four large moons of the planet _____.

1. 1. Saturn
   2. Jupiter
   3. Neptune
   4. Uranus

Light takes nearly 4 years to reach us from the nearest star. What is the distance between that star and the earth?

1. 1. 2.18 x 10¹⁶ m
   2. 2.58 x 10¹⁶ m
   3. 3.78 x 10¹⁶ m
   4. 3.18 x 10¹⁶ m

When and by whom were the rings of Saturn discovered?

1. 1. Galileo; 1610
   2. Newton; 1682
   3. Tycho Brahe; 1590
   4. Edmund Halley; 1682

The visible part of the sun is called _____.

1. 1. Hydrosphere
   2. Troposphere
   3. Ionosphere
   4. Photosphere

What name is given to the path of the sun amongst the stars in our galaxy?

1. 1. Zodiacal
   2. Ecliptic
   3. Elliptical
   4. Celestial sphere