Voyager 1 logs yet another milestone in space history August 17 when it crosses an invisible boundary that marks 100 astronomical units (AU) from the Sun — about 15 billion kilometers (9.3 billion miles) out there — farther away than any human-made object has ever gone in space. It’s headed now for interstellar space. Voyager 2, at 80 AU, is about six years behind.
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Each Voyager carries it own kind of “postcards” in the form of a golden record that Sagan was instrumental in creating. The 12-inch, gold-plated copper discs carry spoken greetings in 55 languages from people all around Earth, along with 115 images and hundreds of sounds representing our home planet.