What is the relationship between the cosmological constant and Hubble's constant?
Doppler effect is that light emitted by a source is shifted by wave
length, when the source moves. In the determination of Hubble's
gives an estimate of the age of our universe. For example, if
conversions of units for parity.
In the past few billions of years, it appears the rate of expansion
of our universe has changed.. Such changes are adopted in
cosmological constant, by making it arbitrary,, to admit both
expansion and contraction of our universe. This guides against