"Google Earth has launched a time-lapse feature that lets users wind back the clock and see how the world has changed over several decades. The feature uses millions of satellite images from the past 37 years to let people scroll through time... Under the hood, the new version of Google Earth is powered by 24 million different satellite photos, from Nasa, the US Geological Survey's Landsat project, and the EU's Copernicus project... The 24 million images date back as far as 1984, and take up 20 petabytes - 20 million gigabytes - of storage space, and 'quadrillions of pixels', the company said..." https://www.bbc.com/news/technology-56760060
