Recent observations indicate that the universe is expanding faster today than it was a few billion years ago (that, in other words, the expansion of the universe is accelerating.) What kind of observations have led astronomers to this surprising conclusion?

Question

Quizplus · Accepted Answer

Astronomers have measured the distance of distant galaxies using Type Ia supernovae, which are known as "standard candles" because they have a consistent luminosity. By comparing the apparent brightness of these supernovae to their known luminosity, astronomers can determine the distance to the galaxy. They have found that the distant galaxies are moving away from us faster than expected, indicating that the expansion of the universe is accelerating.

Recent Observations Indicate That the Universe Is Expanding Faster Today