In 1964, NASA launched Relay 2 as an early satellite. The main objective was to determine the feasibility of launching a satellite that could remain in place and allow for data to be relayed from future manned missions (like the moon shots).
Having fulfilled its purpose, the satellite was decommissioned in 1967, and just left to sit in a high orbit above the earth. And then in mid-June of this year, it suddenly came to life and emitted a strong radio pulse - well beyond anything that could be easily explained.
Scientists are trying to understand what happened here, but its a really fun mystery for now.
The original article is behind a paywall: https://www.newscientist.com/article/2485157-dead-nasa-satellite-unexpectedly-emits-powerful-radio-pulse/
Another free source for a related article: https://www.sciencealert.com/mysterious-radio-signal-caught-bursting-from-long-dead-nasa-satellite
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