What is the primary reason that astronomers suspect that some jovian moons were captured into their current orbits?
A) Some moons have a composition that differs from the composition of the planets.
B) Astronomers have observed moons being captured.
C) Some moons are surprisingly large in size.
D) Some moons have orbits that are backwards (compared to their planet's rotation) or highly inclined to their planet's equator.
Question 2
The magnetic fields carried by jets coming from active galactic nuclei are generated by:
A) the combined magnetic fields of the many stars near the galaxy's center.
B) the central black hole.
C) the movement of the interstellar matter of the galaxy.
D) the movement of the stars in the galaxy.
E) charged matter in the accretion disk of the central black hole.
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