Earth's Sentinel

The European Space Agency is serious about monitoring our environment. Their Copernicus Program is an ambitious, long-term effort to study our planet and understand its changing ways. The most recent addition to this program is the Sentinel-3 satellite series, three Earth-observing birds that will monitor our world with an impressive suite of instruments. The first of the three, Sentinel-3A, launched into orbit on Feb. 16 and is already returning devastatingly beautiful images of Earth. Check. T...