Comments of the Week #27: From the accelerating Universe to our brightest stars
Image credit: The Cosmic Perspective / Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider and Mark Voit. From Azri -- our original question-asker -- on the topic of how long the Universe has been accelerating: "Just when you mentioned that the universe was almost 7.8 billion years old when started accelerating: I think that calculation is based on a "constant” cosmological constant! what if Dark energy was dynamical !? can one expect more than 8 bill years, lets say almost recently!" If dark energy changes over time -- which it may -- then it's conceivable that the Universe began a...
Source: scienceblogs.com