The Cosmological Constant aka Dark Energy

In the 1990s two groups measuring distant supernovae discovered that they were brighter than the distance (determined by the Hubble law) would suggest.
- The expansion of space is accelerating due to a cosmological constant. The energy of this acceleration is equivalent to a contribution to  of 0.7

In the 1990s two groups measuring distant supernovae discovered that they were brighter than the distance (determined by the Hubble law) would suggest.