Cosmic rays
  1. First observations of the spontaneous discharge of an electrometer

    The torsion balance electrometer Coulomb used to…

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  2. Becquerel discovers radioactivity

    The first evidence for radioactivity – images…

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  3. The source: Earth, atmosphere or outer space?

    In studying electrical conduction through air in…

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  4. Theodor Wulf, a new electrometer, and the Eiffel tower

    The original Wulf electroscope (Image: Wikimedia…

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  5. Albert Gockel’s flights

    To measure ionizing radiation away from the earth…

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  6. Pacini and underwater measurements

    Domenico Pacini making a measurement on 20…

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  7. Charles Thomson Rees Wilson sees particle tracks

    Cloud formed on ions due to α-Rays (Image: CTR…

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  8. Victor Hess discovers cosmic rays

    Hess back from his balloon flight on 7 August…

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  9. Kolhörster confirms Hess’s findings

    Increase in ionization with height measured by…

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  10. Robert Millikan coins the term ‘cosmic rays’

    Robert Millikan originally set about to disprove…

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  11. Geiger-Müller counters and the coincidence technique

    Bothe and Kolhorster’s experiment (Image: L.…

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  12. Carl Anderson discovers the positron

    Photograph from Occhialini and Blacket’s paper…

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  13. Bruno Rossi: Cosmic rays are positive charged particles

    Bruno Rossi (Image: Wikimedia Commons) Rossi’s…

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  14. Carl Anderson and Seth Neddermeyer discover the muon

    The muon was discovered as a constituent of…

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  15. Pierre Auger and colleagues demonstrate extensive air showers

    Pierre Auger, who had positioned particle…

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  16. Clifford Butler and George Rochester discover the kaon, first strange particle

    Stereoscopic photographs showing an unusual fork…

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  17. Air Cherenkov discovery Galbraith & Jelley

    The detector used for the first observations of…

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  18. John Linsley detects the first 10^20 eV cosmic ray

    John Linsley detected first cosmic ray with an…

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  19. Detection of high-energy gamma rays from Crab Nebula

    Astrophysicists detected pulsed gamma-ray…

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  20. Fly’s Eye detects record-breaking cosmic ray: 3.2 x 10^20 eV

    The Fly's Eye Mirrors (Image: Courtesy of…

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  21. The AGASA Cosmic-Ray event

    On 3 December 1993, the Akeno Giant Air Shower…

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  22. Baikal – first underwater neutrino telescope

    Satellite image showing spring ice melt underway…

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  23. AMANDA sees first neutrinos in ice

    The photomultiplier tubes within these basketball…

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  24. Pierre Auger Observatory completes its 100th detector

    Upon completing its 100th surface detector, the…

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  25. The CLOUD experiment
    The Cosmics Leaving Outdoor Droplets (CLOUD) experiment as shown by Jasper Kirkby (spokesperson). (Image: CERN)

    New experiment to investigate the effect of galactic cosmic rays on clouds and climate

    The CLOUD (Cosmics Leaving OUtdoor Droplets)…

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  26. Pierre Auger Observatory discovers extragalactic origin of highest-energy cosmic rays

    In November 2007, the Auger project published…

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  27. IceCube construction completed

    On 18 December 2010, the expanded version of…

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  28. Launch of the Alphamagnetic Spectrometer (AMS)

    AMS during tests at the University of Geneva,…

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  29. IceCube presents the 1 PeV event

    In 2013 IceCube presented two events at around 1…

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  30. IceCube measures 5σ significance level for the observation of extraterrestrial neutrinos

    Inspired by the 1PeV events, IceCube began a…

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  31. AMS experiment unveils new territories in the flux of cosmic rays

    The Alpha Magnetic Spectrometer (AMS)…

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  32. IceCube reports first evidence of a source of high-energy cosmic neutrinos

    Scientists at IceCube observatory and…

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