Some Astronomers Searching for What the Mysterious "Dark Matter" Might

Multiple Choice

Some astronomers searching for what the mysterious "dark matter" might be made of have pinned their hopes on MACHO's (MAssive Compact Halo Objects) . What do they think these MACHO's are?

A) huge concentrations of antimatter, outside of galaxies
B) vast clouds of neutrinos, emitted by ancient supernovae
C) black holes, brown dwarfs, and white dwarfs in the regions outside the main disk of our Galaxy
D) "cannibal galaxies" that have swallowed smaller galaxy neighbors until they have grown very large
E) large groups of college football players who have flunked astronomy, and now hang around the outskirts of town, just showing off their muscles