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The planets of our solar system follow nice, predictable orbits, but it was not always so. In the chaotic early days of the solar system , Jupiter and its fellow giant planets seem to have migrated from their birthplaces into the stable orbits that we observe today

Most people know two things about helium. One is that it makes your voice comically high-pitched when you inhale it; the other is that it is extremely light, which is why balloons filled with the stuff float upward through the heavier air. But in particle physics terms--and especially when it comes to the nuclear physics of antimatter--helium is no lightweight.