Here's a thought: what would happen in a system with an antimatter sun and matter planets? I don't recall there being such a thing as an antiphoton, so would there be low enough matter exchange to avoid chaos?
Given the amount of energy that would get released for
any matter/antimatter interaction (mass involved times c
2!), I think we'd be screwed pretty quickly just as soon as any anti-matter solar wind hits us, or (assuming it escaped the same solar-wind fate) the first sun-skimming comet hits the star's outer atmosphere.
One of the big arguments against the possibility of parts of our universe being entirely antimatter equivalents (to try to explain why everything we see
appears to be overwhelmingly matter, rather than the 50:50 that you'd perhaps expect got generated from the initial energy-to-mass of the Big Bang) is that we're not seeing massive ribbons of glowing energy from the parts of the universe where the matter-zones and the antimatter-zones 'touch', however tenuously.
I don't think the "anti-sun" system would be anywhere near as destructive than the
Proton Earth, Electron Moon situation (which is entirely due to the moon being
entirely made of electrons!, ignoring completely the role of the protons), but I suspect it would still be dangerous. As in a "not as lethal as being 1AU from a supernova, but still as lethal as
a hydrogen bomb pressed to your eyeball" kind of level. But I'm willing to be corrected about this...