Which Happened First?

THEMIS

THEMIS
Image: NASA · Public domain · source

Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission began in February 2007 as a constellation of five NASA satellites to study energy releases from Earth's magnetosphere known as substorms, magnetic phenomena that intensify auroras near Earth's poles.

Summary from Wikipedia (CC BY-SA 4.0) · Dates from Wikidata (CC0)

Which happened first?

Timeline

  1. Mars Polar LanderJanuary 3, 1999
  2. Gravity Recovery and Climate ExperimentMarch 17, 2002
  3. THEMIS (this page)February 17, 2007
  4. Gravity Recovery and Interior LaboratorySeptember 10, 2011
  5. Van Allen ProbesAugust 30, 2012
  6. Shenzhou 11October 16, 2016

Related

Play a round with Space · 21st century