The Higgs particle is predicted to exist as part of the mechanism believed to give particles their mass, and is the only piece of the Standard Model of particle physics that remains to be discovered.
For decades, particle physicists have used the hydrogen atom as a benchmark for measuring the size of protons, which are part of the core of atoms.
几十年来，粒子物理学家们用氢原子作为基准衡量质子的大小。
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The southern part of the particle cloud, or solar wind, grazed Earth's magnetic field on the 14th and 15th, resulting in a particularly good night for aurorae.