Statistics for Extraterrestrial Objects Visited by Spacecraft

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Object type	First Spacecraft	Answer	% Correct
Planet	Pioneer 10	Jupiter	100%
Planet	Pioneer 11	Saturn	100%
Planet	Mariner 4	Mars	97%
Moon	Luna 2	Moon	97%
Dwarf Planet	New Horizons	Pluto	97%
Planet	Mariner 2	Venus	97%
Planet	Voyager 2	Uranus	94%
Planet	Voyager 2	Neptune	92%
Planet	Mariner 10	Mercury	86%
Moon	Cassini (Huygens lander)	Titan	69%
Dwarf Planet	Dawn	Ceres	67%
Comet	Vega 1	1P/Halley	50%
Asteroid	Dawn	4 Vesta	19%
Asteroid	NEAR Shoemaker	433 Eros	11%
Asteroid	Galileo	243 Ida	8%
Asteroid	Hayabusa	25143 Itokawa	3%
Comet	Deep Impact	9P/Tempel 1	3%
Comet	EPOXI	103P/Hartley	0%
Comet	Deep Space 1	19P/Borrelly	0%
Asteroid	Rosetta	21 Lutetia	0%
Comet	ICE	21P/Giacobini-Zinner	0%
Asteroid	NEAR Shoemaker	253 Mathilde	0%
Comet	Giotto	26P/Grigg-Skjellerup	0%
Asteroid	Rosetta	2867 Steins	0%
Asteroid	Chang'e 2	4179 Toutatis	0%
Asteroid	Stardust	5535 Annefrank	0%
Comet	Rosetta	67P/Churyumov-Gerasimenko	0%
Comet	Stardust	81P/Wild	0%
Asteroid	Galileo	951 Gaspra	0%
Asteroid	Deep Space 1	9969 Braille	0%
Comet	Ulysses	McNaught (C/2006 P1)	0%