# How have the opinions about the Universe's age changed in last 20 years?

Apr 23, 2018

See details below

#### Explanation:

Following Lamaitre's Theory, the age of universe is depending of the moment of BigBang (Gamov made a fine tunning of this theory)

By other hand, Hubble's theory give a formula to evaluate the age of universe by

v=H·D where $D$ is the distance of a Galaxy, $v$ the velocicty of remoteness and $H$ is the Hubble constant $H = 75 k m {s}^{-} 1$

If we take a Galaxy at 1 megaparsec = $30.87 x {10}^{18}$ km, then

$\frac{1}{H} = \frac{D}{v} = \frac{30.87 \times {10}^{18}}{75} = 4.12 \times {10}^{17} s e g = 13 \times {10}^{19} y e a r s$

Nowadays, the trend is go down the Hubble constant and then, the age of univers is growing in the same proportion