In general, the more massive the star, the ________ its lifetime.
Fill in the blank(s) with correct word
Question 2
Because almost all galaxies show redshifted spectra, we know that
A) the sky must be dark at night.
B) the universe is expanding.
C) our understanding of redshift is wrong.
D) we must be at the center of the universe.
E) the universe is closed.
