New answers tagged hubble-constant
2
votes
Why is the Hubble time same with age of the universe assuming ideally constant expansion?
The present expansion of the universe follows Hubble's law
$$\frac{da}{dt} = H a\ , $$
where $H_0$ is the Hubble parameter and $a$ represents a scale factor (perhaps the distance between two galaxies)....
Top 50 recent answers are included
Related Tags
hubble-constant × 69cosmology × 31
expansion × 24
redshift × 13
observational-astronomy × 9
observable-universe × 8
galaxy × 6
universe × 5
dark-energy × 5
cosmic-microwave-background × 5
astrophysics × 4
distances × 4
general-relativity × 4
gravitational-waves × 3
cosmological-horizon × 3
doppler-effect × 3
friedmann-equations × 3
gravity × 2
history × 2
big-bang-theory × 2
terminology × 2
time-dilation × 2
special-relativity × 2
fate-of-universe × 2
cepheids × 2