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I'm not aware of anti-matter being found anywhere in the universe outside of a particle accelerator, so I'd contend the Anti-matter is (supposedly) found almost everywhere in space, statement.

High energy collisions in space may cause anti-matter - but I'm at a loss to think of any that would (short of a supernova). Further, the anti-matter would be as short-lived as any on Earth - as soon as it meets matter, it mutually annihilates.

The Sun doesn't have the right conditions to create anti-matter. It also won't ever supernova (it's much too little). A supernova may create small quantities of anti-matter, but this would instantly be destroyed on contact with the matter around it.

Matter doesn't have to contact anti-matter to be liberated into energy - nuclear fusion reactions end up with about 99% of the mass of the initial fuel; 1% (or so) is converted straight to energy (which provides the energy from the reaction - at E=mc^2, thats a lot of joules).

Anti-matter has exactly the same gravitational qualities as matter - an orb of anti-Sun would have the same field as an orb of Sun. For a black hole to exist, the actual composition wouldn't matter, as the mass itself is now outside the universe as we know it. It's been compressed to the point where no physical properties can stop it compressing further, so it diminishes to a mathematical point - a singularity. As the strength of gravity varies with the square of the distance from the centre of the object itself, and you could get arbitrarily close to a point object, there comes a distance (for any mass greater than zero) where the gravity field is so strong that the escape velocity from the object - at that distance - exceeds the speed of light. At this distance is the event horizon. So called, because no events closer to the singularity than that horizon can ever link with the universe outside.

For a large enough mass, the distance involved can be quite large (there is reasonable evidence that there is a supermassive black hole at the centre of our galaxy, and possibly at the centre of every spiral galaxy). One suggestion I've heard is:

If the Universe is closed (will collapse in x billion years), then it's gravity is, by definition, too great for anything to escape. thus, the Universe is a super-massive black hole, and we live in it ...

One connection between anti-matter and black holes is Hawking radiation.
The fabric of the universe teems with a sea of virtual particles, like the spray around the foot of a waterfall. Matter-antimatter pairs pop into existence, and then, on a time scale so short that it is all but inconceivable, promptly collide with each other and mutually obliterate. This isn't just intellectual handwaving - it's the effect of virtual particles that can cause magnetic (and other) effects - the "sprays" around real particles pushing against each other.
(It's as if the laws of conservation only work when the universe has time to notice these particles).

Now, around a black hole, the same kind of thing happens. But at some distance, even on the timescales these things operate at, one half of the pair might stray just too close to the event horizon while the other half doesn't. All of a sudden, the surviving half (either a particle or antiparticle) doesn't have it's birthmate for its mutual annihilation. It's cast adrift in the universe, alone and real (rather than virtual). The conservation laws mean that this mass has to be balanced, so an equal mass gets deducted from the singularity (beyond the event horizon, so it probably thought it was quite safe smile ). So a black hole loses matter at a steady trickle, through this Hawking radiation . If it's big enough that the event horizon has enough surface area to suck in enough matter to balance, it's okay. Black holes that are too small, however (or located in mass-barren regions), start to lose mass. So the event horizon contracts. Which makes eating enough to balance the Hawking radiation emissions more difficult, and, in a vicious cycle, the black hole ends up evaporating.

Hope that helps. Definitely interesting areas to provoke thought.

As Pythagoras said,the universe is based on opositions...
For every part of matter,there is an equal part of anti-matter...

The pythagorian pentagram symbolizes the materials that composed world



Those materials are fire(πυρ),air[αήρ],earth[γαία],water[ύδωρ] and anti-matter[αιθήρ]!

This kind of pentagram is also seen in some Davinci's drawings about the perfect human.