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1 How many planets are there in the Solar System? 7, 8, 9, 6
2 How many sets of rings does Uranus have? 4, 2, 0, 1
3 How many spacecraft, as of 2014, have visited Mercury? 3, 2, 1, 4
4 How many times bigger is Saturn than the Earth? 4, 95, 31, 44
5 Hydrogen, Helium and a small amount of Methane provide the composition of which planet? Neptune, Saturn, Uranus, Jupiter
6 Hydra is a moon that orbits which body? Ceres, Saturn, Pluto, Jupiter
7 Hyperion is a moon of which planet? Uranus, Neptune, Saturn, Jupiter
8 Iapetus is a moon of which planet? Jupiter, Neptune, Uranus, Saturn
9 In 1631 Pierre Gassendi made the first telescopic observation of which planet? Mercury, Mars, Saturn, Venus
10 In 1693 Giovanni Zupi observed that which planet actually orbited the sun? Saturn, Venus, Mercury, Mars
11 In degrees Celsius what is the average surface temperature of Neptune? -10, -201, -301, -401
12 In earth days what is the orbital period of Mercury? 88, 6, 116, 34
13 In Kilometres, what is the length of the equator or Mercury? 48879, 4879, 47, 479
14 In relation to the Earth what is the 3753 Cruithne? Asteroid, Planet, Moon, Comet
15 In terms of AU, how far is the Earth from the Sun? 3, 4, 2, 1
16 In terms of composition, what is the second most prominent element on Mercury? Hydrogen, Nitrogen, Sodium, Carbon
17 In terms of distance from the Sun, where does Saturn rank? 4th, 5th, 7th, 6th
18 In terms of ranking, where does Mercury come in a list of the hottest planets? 4th, 1st, 2nd, 3rd
19 In terms of size, where does the Earth rank in a list of the largest planets? 7th, 2nd, 5th, 8th
20 In the 1880s Giovanni Schiaparelli observed which planet and revealed it orbited the sun in just 88 days? Venus, Saturn, Mars, Mercury