Question

I read some where that, Universe is expanding similar to Balloon expanding when air is pumped into it. Can some one give a little explanation to this.

Answer 1

Eh, @BuFu, universe stuff again !
I'll try to find some articles that will be easy to understand, I come back in five minutes.

Answer 2

Thanks for the interest friend.

Answer 3

In the other issue I mentioned the theory of spherical universe (hyper-sphere) :

"In a kind of three-dimensional sphere (this is no longer the surface is curved, as in the classic case of a sphere, but the volume itself). The volume of the universe is finite but without boundary then, like the surface of a sphere is finite without having limits: an ant who travels can still walk straight ahead without stopping." :)

Answer 4

I read in an article, published by NASA in 2011 February. It says that the distance between the stars increasing continuously.

Answer 5

Yea it's the expansion of the universe which seems to increase, we don't really know how, maybe the dark matter

Answer 6

http://en.wikipedia.org/wiki/Dark_matter

Answer 7

is there any experimental proof for the existence of dark matter?

Answer 8

dark matter is something like .. "oh look.. the weighing scale shows 100kg.. but there is nothing on the weighing scale.. not even air.. how can it??".. so we call that "something" which provides that mass.. as dark matter

so experimental proof?!? yes.. experiment itself says some invisible stuff that gives mass.. we are yet to know what are they!

Answer 9

besides the balloon example only says that..

things we are farther away from you are speeding away at a faster rate than things which aere closer to you... ergo.. accelerating expansion! Einstien was right after al!

Answer 10

Try to read that : http://www.nature.com/nature/journal/v404/n6781/full/404955a0.html
Actually, this is the only article that I found and that is clear enough. I recommend you to use Google Scholar for that.
About experimental proofs for dark matter, this is a subtil subject. We only know that if we apply the formulas that we discover decades ago, there is something missing, a mass is not here. The missing mass is called "dark matter".

Answer 11

I struck with another doubt. If dark matter is invisible it even don't reflect photons. then how could scientists observe dark matter.

Answer 12

They don't observe dark matter as this is not observable (this is the essence of dark matter). This is only a theoritical entity that was "created" to complete the void in the formulas.

Answer 13

by a phenomenon called as gravitational lensing..

its more or less like this


when you look at steam you know there is steam how?!? cause the image or the background gets REFRACTED!?? right? not because light gets reflected off of it..

similarly.. heavy masses tend to BEND light and distort the images.. by seeing these distorted images we figure that there must be a big mass..

Answer 14

@Mashy Well, good answer. We observe the consequences of the existence of dark matter, actually. But not the matter itslef.

Answer 15

yes.. correct.. by such phenomenons..