If you had the task of choosing some photos that represented Earth and mankind to extraterrestrial life forms, which photos would you select? NASA had to do this back in 1977 when it launched the Voyager space probes, which are now the farthest human-made objects from Earth. A committee led by Carl Sagan eventually settled on 116 images:
[...] a collection of 116 pictures (one of which is for calibration) detailing but not limited to human life on earth and the planet itself. Many pictures are annotated with one or many indications of scales of time, size or mass. Some images also contain indications of chemical composition. All measures used on the pictures are first defined in the first few images using physical references.
Among the photos chosen was Ansel Adam’s famous Snake River and Grand Tetons photograph.