IIT JEE , AIEEE Forum - Physics , Mechanics

INDIAN_ARMY19890

Hi friends

All of us know that according to big bang theory the distance b/w all bodies of the universe is increasing i.e all are going away from each other

Then why we don"t modify the values of distance b/w sun and earth moon and earth ..........................etc the value which we were using 50 yrs ago are still same any 1 know the reason.?

karthik_abiram

hiiiii,

becoz the earth ,sun ,moon and other planets move as a system and dont move separately......held by the gravitational forces that exist b/n them.....................to make it simpler and to make u understand easier lets take a example............

this is an EXAMPLE only.................a similar case...........this is not wat happens in the system of earth ,sun and moon..........

take 2 ballons and tie them together with a considearably long thread { let there be space b/n them}...........if u leave them from a top of a building the distance of the balloons will change with respect to other bodies ......but not the distance b/n the balloons........................

OUR CASE:-

in our case the "thread" is nothing but the gravitational force...................there are a lot of systems like our in this universe and the distance b/n the various systems only change................................

hope u understand..........................do ask if u have any doubts...........

cheers!

INDIAN_ARMY19890

but all bodys of universe move as a system
planets of our solar system move around sun so they are sattelite of sun planets also have their sattelite
sun also revolve around the centre of universe(centre of mass of our galaxy)
and our galaxy is also revolving around centre of universe
so that means no 1 is seprate

karthik_abiram

hii,

Yea ur ryt............

but according to big bang theory............"they get lost from the observable part of the universe"..............some of the systems have longer orbital radius ................and as they move { i.e as they revolve}.............they go out of the observable part of the universe................and get lost......so this theory is not a stable one.........

as u know big bang theory has disadvantages and all wat is said in the theory is not true............

do ask if u hav any more doubts........

cheers!

vkvashistha

You are right Indian Army19890. Actually no theory have totally correct explanation regarding the begening of universe. That's why we also study about "simple steady theory". Big Bang theory in more developed only due to the reason that we have some relation and formulaes and support many other theories.
We can only guess your question that 50 years 5000years or 50000years are too much short time to determine the deviation in the distance between two particles.

vish0001

yup....50 years or even 5000 years is too small for astronomy to calaculate the drift..so it can be observed only within a range of several lakhs of years

INDIAN_ARMY19890

I HAVE A REQUEST PLZ DON"T MAKE ANY CHANGE IN MESSAGES AFTER POSTING THEM KARTHIK HAS CHANGED HIS PREVIOUS POST

INDIAN_ARMY19890

i just gave an example of 50yrs

krishna.gopal

for this you will have to see the hubble's law. it says velocity os sep v=H*d where d is distance beteen bodies and H is constant and its value is 71km/sec/mega parsec. for earth and sun this velocity comes out to be about 1-^-11 Km/sec.
So no need to change distance

INDIAN_ARMY19890

thanks a lot sir

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