Question

what exactly is a white hole ? can we like see it or feel it ??

Answer 1

A white hole is the exact reverse of a black hole.

Black holes are objects so dense that warp space time to such an extent that objects that cross their event horizons cannot escape. In a white hole, space time is warped to an extent where nothing approaching it can cross a horizon and fall into it. they are products of a solution to the Einstein field equations (though this does not mean that they have to exist)

In fact it is hypothesised that if they did exist, they could form the exit of a black hole, with the black hole-white hole pair being linked through space time via a wormhole. Some even go so far as stating that the black hole-white hole pair, may form bridges between different universes

Note though, that while we have evidence of black holes (indirect though that may be), we have no evidence for the existence of whit holes, and only exist as theoretical/hypothetical objects. Also, there appear to be issues with white holes obeying the second law of thermodynamics. As such they are not believed to be possible to exist

Answer 2

awesome :D