The Alpha Magnetic Spectrometer (AMS-02) on the International Space Station (ISS), shortly after installation. A Space Shuttle and Soyuz capsule are docked, with Earth in the background. AMS-02 detects high-energy positrons, potentially linked to dark matter or pulsars.
Astronomy Picture from 06/10/2014
Space Station Detector Finds Unexplained Positron Excess
Source: https://apod.nasa.gov/apod/ap141006.html
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