On 11 September 1985 ISEE-3 flew through the plasma trail of Comet Giacobini-Zinner and became the first spacecraft to encounter a comet. Photo: Kitt Peak, 1998.
29 Years Ago Today: ISEE-3 Makes The First Comet Encounter
On 11 September 1985 ISEE-3 flew through the plasma trail of Comet Giacobini-Zinner and became the first spacecraft to encounter a comet. Photo: Kitt Peak, 1998.