Fate of the Universe Flashcards
why arguable decides the fate of the universe?
whether gravity is strong enough to halt expansion of the universe
how can we estimate the mean density of the universe?
using masses from galaxy clusters
how can we directly measure the expansion history of the Universe?
we need to determine the rate of expansion in the past…need to look at very distant galaxies
how can we determine how space has expanded with time?
measuring the relation b/w redshift and distance
what is the brightest standard candle?
type Ia supernova
what have distant galaxies on Hubble diagrams shown?
the more distant galaxies show that the expansion first decelerates and now Is accelerating
dark energy
acts as a repulsive force that causes the universe to expand
what kind of universe do we appear to be in?
a flat Universe that will expand ever faster with time
