Age

Age Appendix E. Glossary of Terms.
Age of the Universe t₀

Radioactive isotope studies yield ages of at least nine to sixteen billion years for our Galaxy, and the ages of the oldest star clusters put the limit at about 14 billion years.

The Universe is about 13.9 billion years (-1.4 to +1.7 billion years).
Source: University of Chicago, "Long Distance Discovery", Sky and Space June/July 2000 pp 26-27

We can use the Hubble's Constant to estimate the age of the universe.
If H₀ = 100 km/sec/Mpc, an estimate of the age of the universe is:

t_o = d/v

t_o = d/( H_o . d ) = 1/ H_o

For H₀ = 50 then t₀ is 20 x 10⁹ years

For H₀ = 75 then t₀ is 13 x 10⁹ years

For H₀ = 100 then t₀ is 10¹⁰ years (10 billion years)

"Evolution of the Galaxies" http://csep1.phy.ornl.gov/guidry/violence/galaxies-evol.html [Date accessed 11 Apr 2000]

Back to Beatrice Tinsley