On Tue, Apr 14, 2015 spudboy100 via Everything List < everything-list@googlegroups.com> wrote:
> Yes, but the WMAP nobelists in 1997 claimed that it proved an increased > acceleration. > In 2003 Adam Riess presented observational evidence that although the universe is 13.8 billion years old for most of that time it was actually decelerating, it only started to accelerate 5 billion years ago. This makes sense because long ago the matter density of the universe was greater than now so matter's gravity would tend to slow the expansion, and Dark Energy which works in the opposite direction with a sort of anti-gravity effect comes from space itself, and long ago there was less space than now. The technical term for a change in acceleration is a "jerk"; in 2003 The New York Times ran a headline COSMIC JERK DISCOVERED, underneath that was a large picture of Adam Riess. His colleagues have never let him forget it. John K Clark -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
