Which was launched first, the Swedish satellite Odin or the Herschel Space Observatory?
Herschel Space Observatory:  It was active from 2009 to 2013, and was the largest infrared telescope ever launched, carrying a 3.5 m mirror and instruments sensitive to the far infrared and submillimetre wavebands (55–672 µm). Odin (satellite):  Within the field of astrophysics, Odin was used until the spring of 2007 aiding in the study of star formation. Odin (satellite):  Odin is still used for aeronomical observations, including exploration of the depletion of the ozone layer and effects of global warming.
i don't know