Which of the following are the jovian planets?
A) Jupiter, Saturn, Uranus, Neptune, and Pluto
B) only Jupiter
C) only Jupiter and Saturn
D) Jupiter, Saturn, Uranus, and Neptune only
E) everything past Mars and the asteroid belt
Question 2
How do we know what happens at the event horizon of a black hole?
A) Physicists have created miniature black holes in the lab.
B) Astronomers have sent spacecraft through the event horizon of a nearby black hole.
C) Astronomers have analyzed the light from matter within the event horizon of many black holes.
D) Astronomers have detected X-rays from accretion disks around black holes.
E) We don't know for sure: we only know what to expect based on the predictions of general relativity.
Size comparison of Earth and Uranus
the comet Encke riding along its pebbly trail of debris (long diagonal line) between the orbits of M
Lo, Jupiter
Numerous Thin Ringlets Constitute Saturn’s Inner Rings
Discovery of Pluto
Planets