Galactic disks appear blue because:
A) they contain no G, K, or M dwarfs.
B) they contain only blue reflection nebulae.
C) dust obscures the longer, red, wavelengths.
D) O and B blue giants are much brighter than G, K, or M dwarfs.
E) dark matter gravitationally shifts all wavelengths towards the blue.
Question 2
Discovered by the spacecraft Galileo, Dactyl is a satellite of larger Ida.
Indicate whether the statement is true or false
