| 41. | Antimatter protons would be negatively charged and called antiprotons.
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| 42. | Has his brother stepped through some mysterious doorway into the world of antimatter?
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| 43. | And NASA is building an antimatter engine and tinkering with a tractor beam.
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| 44. | That could help explain why matter rather than antimatter dominates the universe today.
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| 45. | Physicists believe antimatter is the mirror image of conventional matter in the universe.
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| 46. | When a matter and corresponding antimatter particle meet, they annihilate each other.
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| 47. | Antihydrogen ( ) is the antimatter counterpart to hydrogen.
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| 48. | But antimatter is rare in our universe, and must be made first.
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| 49. | Knowing the value of the matter-antimatter asymmetry.
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| 50. | Because you can't turn matter into antimatter.
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