 |
|
|
|
|
|
|
|
|
|
|
|
| • |
Plot
of mv vs.
z is really a plot of distance vs.
velocity
|
|
| • |
If
faint (distant earlier)
objects show slightly higher z
|
|
|
than
expected from extrapolation based on nearby (present day) objects,
|
|
then
expansion rate was faster in the past and has been decelerating
|
|
|
| • |
Surprise
results from 1998 indeed do suggest accelerating expansion
|
|
| • |
May be due to “cosmological constant” proposed by Einstein
|
|
|
– |
AKA “Dark energy” or “Quintessence”
|
|
|
– |
See Science News: http://sciencenews.org/articles/20030802/fob1.asp
|
|
