A live satellite view of Earth is available online on the official website of the National Aeronautics and Space Administration, or NASA, as of 2015. Users can also view NASA's live coverage of the planet at Ustream.
NASA's live satellite streaming of Earth was made possible through the High Definition Earth Viewing, or HDEV, program initiated by the American agency. The project became operational on April 30, 2014. The live satellite view is being fed by four HD video recorders installed on the International Space Station's external structure. A black image appearing on the screen at either Ustream or NASA's websites signifies that the International Space Station is currently orbiting the planet's night side. A taped video or gray screen may also indicate signal loss from the space station or that the HDEV is experiencing downtime.