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it takes lots of energy to put them together to make water,so even if there is example 50 %hidrogen and 50 % oxigen,it takes quite a lot of force or pressure to make it into water
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Water molecules exist at a lower energy level than Hydrogen and Oxygen molecules: converting to water releases energy. You do need a small amount of energy to start it off, but the additional energy provided by the reaction provides this for the rest of the raw material. This process is called burning.
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Let's break this down for a moment; a black hole is called 'black hole' because:
a) It does not emit light (i.e. black)
b) It's gravitational pull is so strong that almost nothing can escape (i.e. a hole)
Something with the name 'white hole' would emit light, but would still be a hole. Note that this also means that the gravitational pull must therefore be weaker as it is that force that stops light from being emitted.
What you're hypothesising about would be some sort of infinite emitter of light and particles, which is impossible. I suppose the closest thing to an 'opposite' of a black hole would be a supernova, which is a massively exploding star.
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It doesn't actually have to emit anything. It is called a "white hole" because it is the opposite of a black hole, in that it has a very strong repulsive, antigravity force. It won't emit anything if there is nothing to emit, and such an object would be very exotic indeed. They are theoretically possible, but we currently know of no substances, exotic as they would be, that could have the required properties, nor a process likely to produce such an object. Conventionally we should think that they would be about as unstable as objects can get, since its very force should probably blow it apart.
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Has anyone seen that new poster that revolutionises the theory of black holes (I'll try and find it) basically scientists now believe that black holes actually throw two rays of light and matter away from the hole which collides with other things in the area of the hole, devastating whole systems, there's one in this forming galaxy of which name I forget (I'll try to find this too!)
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I don't know what you are talking about, but it has been known that "feeding" black holes emit radiation and jets of plasma due to, for example, the synchrotron process. In fact, this accounts for active and radio galaxies, in the center of which are supermassive black holes formed in the centres of thew colossal gas clouds that were the early pre-star galaxies, and are possibly responsible for star formation.
It is now known that most (if not all) galaxies contain such a black hole, on the order of thousands to billions of solar masses. Ours certainly does.
