Voyager 1 is about to become the first human-made object one light-day from Earth
ScienceDaily carried a NASA Jet Propulsion Laboratory release saying Voyager 1, launched in 1977, should reach 16.09 billion miles from Earth on 18 November, a full light-day away, so a radio command will take 24 hours to arrive. No other spacecraft has gone so far. In September engineers finished a months-in-the-making swap, nicknamed the 'Big Bang', replacing three heating devices with ones that use less power, which should keep its remaining instruments running longer. The probe also gave the team a scare: its signal went missing on 18 and 19 October, then came back on 20 October after it switched itself to backup thrusters.
A machine built almost 50 years ago is still sending home news from interstellar space.
Voyager 1's power drops about 4 watts a year, engineers have not yet explained the October blackout, and more instruments will eventually have to be switched off.







