NASA is the National Aeronautics and Space Administration. It is the US Government agency in charge of the civilian (non-military) space program, and in charge of research in aeronautics (the design and construction of aircraft), astronautics (the science and technology of space flight), and aerospace (the earth's atmosphere and the space beyond).
It was set up in 1958 under President Eisenhower.
Its most famous missions were the Apollo moon-landings, the Skylab space station, and the Space Shuttle.
NASA is one of the agencies responsible for the International Space Station (started in 1998).
NASA hopes to send a human mission to Mars in the not too distant future.
The SUOMI satellite images of the Earth at night shows us in great detail where lights are (electric and non-electric) and therefore the impact of human settlement and activity (in the day we can only see land, oceans and cloud).
Human settlement is bound by natural borders (e.g. the Himalayas) and by political borders (e.g. North Korea and South Korea).
The distribution and density of human populations over the whole planet is shown clearly by these satellite images.
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