Observations of Type I supernovae in distant galaxies have shown that:
A) the star formation rate in galaxies decreases with increasing redshift
B) the expansion rate of the universe is increasing
C) the cosmological constant is zero
D) dark energy is negligible at the present time
E) there were more stars in the past than at the present time

Question

Quizplus · Accepted Answer

Type I supernovae have been used as standard candles to measure the expansion rate of the universe. The observations have shown that the expansion rate is increasing, indicating the presence of dark energy. The other choices are not directly related to the observations of Type I supernovae.

Observations of Type I Supernovae in Distant Galaxies Have Shown