Dark Energy: Can a Theoretical Entity Be Measured?
July 17, 2010
The redshift of galaxies has been measured for some 90 years, but the existence of “dark energy” was postulated only recently – in the late 1990s. It was needed to explain unexpected dimness of the most distant galaxies, as measured by Type Ia supernovae. Some cosmologists claim they are measuring dark energy – others say […]
