The Time history of events and macro scale interactions during substorms(THEMIS) mission was originally a constellation of five NASA Satellite. These five NASA Satellites are Themis is A to Themis E.
The name of the mission is acronym alluding to the Titan is known as Themis.
The Themis mission comprising five identical probes,aims to gain new insights into the colourful displays in high latitude skies.
A US space agency mission to study auroras – the Northern lights has blasted off from Cape Canaveral in Florida after it was delayed by wind.