According to our basic scenario of solar system formation, why do the jovian planets have numerous large moons?
A) As the growing jovian planets captured gas from the solar nebula, the gas formed swirling disks around them, and moons formed from condensation accretion within these disks.
B) Because of their strong gravity, the jovian planets were able to capture numerous asteroids that happened to be passing nearby, and these became the major moons of the jovian planets.
C) The large moons of the jovian planets originally formed in the inner solar system and these moons then migrated out to join up with the jovian planets.
D) The many moons of the jovian planets remains one of the unexplained mysteries of the formation of our solar system.
Question 2
Approximately how many other planetary systems have been discovered to date?
A) tens
B) hundreds
C) thousands
D) tens of thousands
E) millions
