In the raisin bread analogy, what does the dough represent?
a. stars
b. galaxies
c. black holes
d. interstellar space
According to the steady-state theory, _____.
a. dark energy is an important factor
b. the universe was once very hot and very dense
c. new matter is constantly being added to the universe
d. the temperature of the universe has been decreasing steadily for 15 billion years