Q 01/05
A) Ganymede
B) Callisto
C) Europa
D) Triton
Answer · why
Titan was thought to be bigger until Voyager 1 showed its haze had inflated its apparent size.
Q 02/05
A) Mercury
B) Mars
C) Venus
D) Pluto
Answer · why
Despite the size, Titan has only 40% of that planet's mass because it is mostly ice.
Q 03/05
A) Giovanni Cassini
B) Galileo Galilei
C) Johannes Kepler
D) Christiaan Huygens
Answer · why
The Dutch astronomer built his own telescopes with his elder brother Constantijn.
Q 04/05
A) Saturni Luna
B) Stella Saturni
C) Sidus Batavum
D) Luna Nova
Answer · why
He published the find in the tract De Saturni Luna Observatio Nova.
Q 05/05
A) Giovanni Cassini
B) Urbain Le Verrier
C) John Herschel
D) William Herschel
Answer · why
He named all seven then-known Saturnian moons after mythological giants.
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