Joke or not, Location Earth Dogtags seem to be something you can actually buy. The text of the website sounds sincere except for the money-back guarantee, which seems intentionally worded for maximum irony. I have no idea.
These are cute but the image seem to lack the reference values used in the Pioneer probes' engravings in order to obtain precise values for pulsar distances. I wouldn't trust these if I were abducted.
The Voyager Gold Record images did, however, include Mollweide Equal-Area Projections of Earth landmasses, past present and predicted future so featuring something like this on the keychain isn't too unreasonable.
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The Voyager Gold Record images did, however, include Mollweide Equal-Area Projections of Earth landmasses, past present and predicted future so featuring something like this on the keychain isn't too unreasonable.