A decade before Hubble made his observations, a number of physicists and mathematicians had established a consistent theory of an expanding universe by using Näytä lisää

Start with the Friedmann equation:
where $${\displaystyle H}$$ is the Hubble parameter, $${\displaystyle a}$$ is the scale factor, … Näytä lisää

Hubble time
The Hubble constant $${\displaystyle H_{0}}$$ has units of inverse time; the Hubble time tH is … Näytä lisää

• Accelerating expansion of the universe – Cosmological phenomenon
• Cosmology – Scientific study of the origin, evolution, and eventual fate of the universe
• Dark matter – Hypothetical invisible matter Näytä lisää

The discovery of the linear relationship between redshift and distance, coupled with a supposed linear relation between recessional velocity and redshift, yields a straightforward … Näytä lisää

The value of the Hubble constant, H0, tells the rate at which the universe is expanding. In 1929, Edwin Hubble determined for the first time this constant to be 500 km/sec … Näytä lisää

• NASA's WMAP B ig Bang Expansion: the Hubble Constant
• The Hubble Key Project
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