The news has rocked the world of astronomy as baffled space experts struggle to explain why the outdated satellite has mysteriously returned.
The LES1 was built back in 1965 but amateur astronomer Phil Williams has picked up a signal this week.
He noticed a "ghostly sound" in the signal – sparking truth seekers to speculate whether it may have been hijacked by aliens in a bid to communicate with us.
Phil though, thinks that a component failure caused the satellite's transmitter to start up again.
And because Phil believes the satellite is tumbling over on itself every four seconds, the signal is fluctuating dramatically.
The satellite never reached its intended mission orbit in 1967.
LES1 was launched from Cape Canaveral on February 11, 1965, but only a few of the mission's objectives were accomplished.
Circuitry miswiring caused the satellite to cease transmitting in 1967.