View Full Version : Astronomers Closing in on Dark Energy with Refined Hubble Constant

2009-May-07, 02:40 PM
The name “dark energy” is just a placeholder for the force — whatever it is — that is causing the Universe to expand. But astronomers are perhaps getting closer to understanding this force with new observations of several Cepheid variable stars by the Hubble Space Telescope, which has refined the measurement of the Universe’s [...]

More... (http://www.universetoday.com/2009/05/07/astronomers-closing-in-on-dark-energy-with-refined-hubble-constant/)

2009-May-07, 03:31 PM
Type Ia supernovae all explode with nearly the same amount of energy and therefore have almost the same intrinsic brightness.

I think it might be more accurate to say that Type 1a supernovae remnants all have close to the same amount of Ni56 decaying and therefore have alost the same intrinsic brightness. The actual energy of the explosion isn't really observed. Still, another great article by Nancy!