Hubble Helps Measure the Pace of Dark Energy - Universe Today
The Hubble Space Telescope has further confirmed the existence of "Dark Energy" - a mysterious force that seems to be accelerating the expansion of the Universe. The giant space observatory examined some of the most distant supernovae ever seen and found that this force seems to have been acting at a constant rate for as far back as astronomers can see. This is good news. If dark energy continued to accelerate, some physicists believe the fabric of the Universe could tear apart in an event called "The Big Rip".