Question

what did galileo deduce from the fact that he could never see two of these planets in conjunction at their greatest elongation from jupiter?
a they were not actually moons
b they were optical illusions
c they revolved in unequal circles
d they revolved in equal circles
question 11 (1 point)
which statement best describes the speed of revolution for the observed moons?
a outer moons revolve faster than inner moons
b speed of revolution is random
c all moons revolve at the same speed
d inner moons revolve faster than outer moon
question 12 (1 point)
what was the approximate period galileo observed for the planet tracing the largest orbit around jupiter?
a daily
b weekly
c semimonthly
d monthly

Explanation:

• For the first question, Galileo deduced that the moons revolved in unequal circles as they couldn't be in conjunction at greatest elongation.
• For the second question, according to Kepler's laws and gravitational - orbital mechanics, inner moons revolve faster than outer moons around a planet.
• For the third question, Galileo observed that the moon with the largest orbit around Jupiter had a period of about a week.

Answer:

1. c. they revolved in unequal circles
2. d. inner moons revolve faster than outer moon
3. b. weekly