
How does a spacecraft launched in 1977 keep transmitting from beyond the heliosphere on less electrical power than a single hallway bulb, and why does its signal now take more than 22 hours to reach Earth?
Voyager 1 still transmits from 15.8 billion miles away on the power of a hallway bulb — here is exactly how its plutonium generators, 69-kilobyte computers, and 22-hour signal delay actually work.







