"When gone am I, the last of the Jedi will you be." Yoda's words in Return of the Jedi have long been the text fans cite when thinking about the Jedi in the larger Star Wars universe. Yoda is one of the wisest beings ever, so he's telling the truth. Any other Jedi who we see in books, TV shows or movies must surely be gone by this moment at the very latest, right?

The antimatter of science fiction vastly differs from the real-life antimatter of particle physics. The former powers spaceships or bombs, while the latter is just another particle that physicists study, one that happens to be the mirror image with the opposite charge of the more familiar particles.