From volcanoes in Iceland to wildfires in California, Nasa has made nearly three million images of Earth's thermal emissions available to the public for free. The stunning images were captured by Japan's Advanced Spaceborne Thermal Emission and Reflection Readiometer (Aster) instrument onboard the Terra spacecraft. Together, the database has been described as a 'multimodal version of Google Earth' allowing anyone to have a look at a region's environmental changes in incredible detail.
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