Long-wavelength spectrometer from the Infrared Space Observatory (identical spare model)

Seeing through cosmic dust

Cosmic dust between the stars blocks out visible light, but it can be penetrated by infrared. Scientists study the infrared radiation emitted by gas molecules to find out more about cooler areas of space where stars have yet to form, or have died. This instrument is identical to one flown on the Infrared Space Observatory, launched in 1995. This satellite revealed the presence of water in many parts of our galaxy.