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The twin Van Allen Probes launched 6 years ago today! 
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?? These spacecraft are solving scientific puzzles about the dynamic, donut-shaped radiation belts around Earth, which teem with energetic particles that can affect our technology.
UC Berkeley’s Space Sciences Lab Designed Built and Integrated two sets of identical instrument suites, one for each spacecraft. An Instrument suite comprised two 6 meter AXB’s or Axial Staceer Booms and four 50 meter SPB’s or Spin Plane Wire Booms and an Electronics Package.
nasa.gov/vanallenprobes
