User:VARENDRA MAURYA

CENTRE OF UNIVERSE

'''We know that everything in a universe are in relative motion with each other, under the gravitational force of other heavily bodies. At this instant a simple question comes to our mind that where universe had its boundary, where it had its centre.'''

For answering this question first lets understand few terms related to this-

1.) BLACK HOLE : It is a highly densile substance which has escape velocity greater than the light (i.e greater than 300000000m/s). It means no light is coming from the black hole (after reflection or its own) due to attraction of light by gravitational force of black hole.

Note that no other body is present in universe that has stronger gravitational field than black hole, if it is present then it will be considered as black hole and former would be as simple body.

2.) ELLIPTICAL PATH OF REVOLUTIONARY OBJECT:

'''As we read Kepler law of planetry motion we come to know that earth has elliptical orbital path. This is theoretical concept but practically it is elliptical because Earth is revolving around sun and sun is revolving around solar system and this process continues till black hole. Now Earth revolves due to centripetal force of sun which make it to revolve in circular orbit but source(sun/centre) of circular orbit(circle) is in orbital motion, so due to this path became elliptical. So if any source will be stationary then the object revolving around it will have circular path.'''

'''Now, as we come across to know that no body have stronger gravitational force like black hole, so any other body do not have tendency to provide centripetal force to black hole such that it starts revolving. So we conclude that black hole is only stationary point in universe. To detect the possibility of black hole we have to find revolutionary body having pure circular path and at the centre of that circular path black hole is present which make all bodies present in universe mobile. And this black hole is taken as dimensional grave tick centre of universe. Similarly, heavenly body having most elliptical orbital path would be regarded as boundary of universe.'''

NOTE: Earth is revolving in elliptical orbit according to sun but it may be possible that it is revolving in circular orbit according to black hole.