NASA is looking at another 18,000 years before the spacecraft achieves a full light-year and more than double that before it comes near another star. Voyager 1 nears one light-day from Earth, extending humanity’s reach into interstellar space with records, signals, and cosmic wonder. NASA's Voyager 1 is set to become the first human-made object to travel one light-day from Earth, covering nearly 16 billion miles after almost 50 years in space.