What Does Dark Energy Really Do?

The video explores the concept of dark energy and its role in the universe's expansion. It discusses how the universe's expansion history can be measured using redshift and distance, with supernovae acting as standard candles. The discovery of the universe's accelerating expansion, which earned a Nobel Prize, is explained through the cosmological constant. The video concludes with a discussion on the future implications of dark energy, suggesting an exponential growth of the universe.

How do astronomers measure the past expansion history of the universe?

What evidence led to the discovery of the accelerating expansion of the universe?

Discuss the implications of a universe with a constant vacuum energy.