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The Expansion of the Universe


A beutiful quote on description of Science by Edwin Hubble















Hello everyone and welcome back to my blog

Today we are going ot talk about 'THE GENIUS' that changed the course of Cosmology
So first we are going to talk about

So gear up and off we go...

1) Hubble's Law

Hubble's Law states that v = HoD
wherein:-
 v represents Velocity (IN km/sec)
 Ho  represents the Hubble’s Constant (Current Value is 73.8 km/sec/Megaparsec)
D represents the distance to the galaxy (In Mpc)


"It is a law stating that the red shifts in the spectra of distant galaxies (and hence their speeds of recession) are proportional to their distance"

A red shift is observed when objects are moving farther from us and this law went against is ideas of Newton and others for a static universe

A GIF on the Expansion of the Universe


(Interesting Fact- Einstein refused to accept an expanding universe even though his theory proved so!!!)

In his short paper, Hubble presented the observational evidence for one of science’s greatest discoveries—the expanding universe. More distant galaxies recede faster than nearby galaxies.



The paper of 1929 made him so famous (Man What a Genius !!!)

Never ever again will a man like him be born to change the perspcetive of looking at the Universe

Now that's enough about Hubble 

Now we will talk about different scenarios in the Expansion of the Universe

1) The Big Crunch (in which it will return to big bang phase) 

2) Big Rip (in which the expansion will tear apart the universe)

3) Big Cold Death (in which expansion will continue at constant rate and universe will remain cold)


The high density model is Big Crunch 
The accelerating (open) model is Big Rip
The flat model is Big Cold Death (Very Boring)

I would like to end it with a beautiful quote by Richard Feynman



That's it for today 

I will be back tomorrow with more interesting stuff
Till then Bye

Yours,
Universal Physics Expert signing off
Khushil



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