You know what they say about truth being stranger than fiction (because fiction is restrained to the plausible, while truth doesn't care if you can believe it or not).
Apparently, there are rings of anti-protons circling Earth (that we've just now discovered).
Along comes Reality.
Turns out there's a bunch of anti-matter floating around our planet, waiting to be harvested. What's more, larger planets (say, Jupiter) would have even more of this stuff, floating around, trapped in the planet's magnetic belt like a cosmic gas station. "Park Your Vehicle Here: Free Anti-Matter!"
Sure, there may be some technical difficulties to that. Like how do you harvest something that self-destructs and unleashes vast amounts of deadly radiation whenever it touches real matter? (This might help.) And how do you build a spaceship with anti-matter engines without frying all the passengers with radiation and also without radiation shielding that weighs more than a small black hole?
As Sheldon from Big Bang Theory says, "I leave that to the engineers."
But for SF writers? We just got a cool new refueling idea for all those interplanetary expeditions. Until Reality one-ups us again.