The Voyager 2 spacecraft is 20 billion kilometres away and has lost track of Earth. A radio dish near Canberra is the only channel for re-establishing communication.
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In the void of interstellar space, the most distant emissary of humankind carries a message that will last for billions of years.
A professor of religion and science explains different views on immortality, from the religious perspective of President Jimmy Carter to the scientific, secular take of Carl Sagan.
