1) Environmental satellite 
The largest and most powerful Earth observation satellite ever built by the European Space Agency; it is a successor to ESA`s ERS remote sensing satellites ERS-1 and ERS-2. Envisat was launched on Mar. 1, 2002 aboard an Ariane 5 into a sun-synchronous orbit at a height of 790 km (±10 km). It orbits ...
acronym: environmental satellite