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50 Years Ago

Key to Other Worlds

12:30PM, August 9, 2013

Excerpt from the August 17, 1963, issue of Science News Letter

Neutrinos, nature’s most elusive atomic particles, could serve as a key to detecting other “suns” in the universe made of anti-matter, the opposite of the kind of matter found on earth, and in our sun. This possibility was suggested by Dr. Bruno Pontecorvo, [who] fled from England to Russia in 1950 and is now a Soviet citizen, considered one of Russia’s top physicists….  Anti-matter worlds cannot be detected by their light, since the photons carrying light’s energy are neutral and therefore the same, whether emitted by normal matter or by anti-matter. However, neutrinos and anti-neutrinos can be told apart since they have a different direction of spin, or helicity. A star made of anti-matter, which would be converting antihydrogen into anti-helium, would emit anti-neutrinos and could therefore be told from a star burning normal

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