Dozens of cameras circle of the Planet Earth documentary in detail, but few that offer a view of the world.
The handful of rare visions have shown that "the Earth is a very small stage in a vast cosmic arena," wrote the late Carl Sagan in Pale Blue Dot: A Vision of the future of humanity in space.
Robotic probes for most of the photos of the Earth and the Moon on its way to the planets, asteroids, comets and even other star systems. However, the practice of taking self-portraits warming is seldom artistically motivated.
"In general, we can do to calibrate instruments and verify the trajectory of a spacecraft. If the point where they think the Earth is and see, then you are probably where you think you are," said planetary scientist Mark Sykes of the Planetary Science Institute.
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