We fight for SPACE on earth! But many of us dont know that we have got space which is unlimitedly available outside our "world of space" the real space! Though this space is unlimited, it is inaccessible.
Let us come to the scientific aspect of it! Lets start with Big Bang theory! I am trying to create a virtual model so that we get familiar with whats around when we land in space!
Consider there is a dark place, (you cant see anything ), but the place is going to infinity (something which is beyond our imagination!) radially (3D and not in 2D). At this centre lets assume an atom (which is highly compressed !) is present. We now say that the atom underwent a BIG BANG (explosion) and the content inside it went off in all directions. These under some forces (like attraction, gravitation etc) became clouds and slowly formed visible particles and further slowly formed in hard rocky material and then the huge rocky bodies! The ones which had got fuel (hydrogen and helium) became stars and the remaining became planets , asteroids, comets etc. The interesting thing here is, these small and huge bodies did not stay quiet they went on revolving around something or the other. And from here the theory of "Universe is Expanding" came into existence, and the contents which exploded out of the single atom travelled huge distances from the centre. This whole volume upto which the particles have reached is collectively considered as the space. So space is something which we have assumed to be the part of the dark room upto which the contents of the atom (exploded) have reached.
The theory of expansion has changed! As observed the expansion rate has decreased which was supposed to be increasing before!
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