The Canadian Space Agency's SCISAT-1 satellite was launched in 2003 to measure the depletion of Earth's ozone. The satellite is still operating 20 years later, obtaining valuable data on changes in ozone, the climate, and air quality.

SCISAT-1 is part of ESA's Third Party Missions programme, in which ESA has an agreement to promote the availability of free data products from the mission.

Learn more about SCISAT-1 in our new infographic: