17 November

1995: On 17 November 1995, ESA's ISO mission was launched by an Ariane 44P launcher from Europe's spaceport in Kourou, French Guiana.

Probing the cool and hidden Universe, the Infrared Space Observatory (ISO) was the most sensitive infrared satellite ever launched. ISO made particularly important studies of the dusty regions of the Universe, where visible light telescopes can see nothing. The wealth of data collected by ISO still produce important science results.