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Recordeddatespace

Active volcanism found on Io

Three days after closest approach, navigation engineer Linda Morabito was processing a deliberately over-exposed optical navigation frame — taken to fix the spacecraft's position against background stars — when a crescent of light appeared off Io's limb. It was an eruption plume, and it was the first active volcanism observed anywhere beyond Earth. The finding came from an image taken for engineering purposes, not from a planned science observation.

Historical — it happened, and the record is settled.

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Recorded on Io

  1. The full Grand Tour is cancelled and rebuilt as a two-spacecraft mission
  2. Pioneer 10 passes Jupiter — the first spacecraft to reach the outer Solar System
  3. Pioneer 11 passes Jupiter, bending north toward Saturn
  4. Voyager 1 launches
  5. Voyager 1 closest approach to Jupiter
  6. Active volcanism found on Io
  7. Voyager 2 closest approach to Jupiter
  8. Voyager 1 passes Saturn and Titan, and leaves the plane of the planets
  9. Voyager 1 photographs the solar system from outside it
  10. Galileo enters orbit around Jupiter — the first outer-planet orbiter
  11. Cassini passes Jupiter for a final speed boost toward Saturn
  12. Galileo is flown into Jupiter to end its mission
  13. Voyager 1 crosses the termination shock at about 94 AU
  14. New Horizons takes a gravity assist at Jupiter
  15. Voyager 1 crosses the heliopause at 121.6 AU
  16. The 2012 crossing is confirmed from plasma oscillations
  17. Juno enters polar orbit around Jupiter
  18. Voyager 1's cosmic ray subsystem is switched off
  19. Voyager 1's low-energy charged particle instrument due for shutdown
  20. Voyager 1 reaches one light-day from Earth

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