【科学60秒】宇宙版《霍顿与无名氏》_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】宇宙版《霍顿与无名氏》

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"Six thousand billion of them are going through your body every second." That's physicist Lawrence Krauss on neutrinos, on the June 15th weekly Science Talk podcast. "Neutrinos are the lightest elementary particles we know of. The name comes from the fact that they had to be ____1____ because we couldn't see them in detectors. But they had to be light. So Enrico Fermi called them "a little neutron," in Italian is neutrino. So they were baby neutrons, which were the only other neutral particles at the time that were known."
Now astrophysicists have put a best-guess ____2____ on the mass of the neutrino. The research is being reported this week at the Weizmann U.K. conference at University College London and will appear in an ____3____ issue of Physical Review Letters.
The work took advantage of the huge 3-D galaxy map called Mega Z. Because there are so many neutrinos, ____4____. And the researchers say the ____5____ map depends on a neutrino's mass being no more than 0.28 electron volts, less than a billionth of the mass of an atom of hydrogen, the lightest element. "These are the most interesting particles in nature."