Several articles published today (November 7) claimed that Cox and co-presenter Dara Ó Briain were "banned" from attempting to contact possible life on a new planet.
Talking about a new planet discovered by amateur stargazers, Cox told BBC 6Music this morning: "We've never pointed a radio telescope at it and you never know, and the BBC actually said, 'But, um, you can't do that, because we need to go through the regulations and health and safety and everything in case we discover a signal from an alien civilisation'.
"I said, 'You mean we would discover the first hint that there is other intelligent life in the universe beyond Earth, live on air, and you're worried about the health and safety of it?!' They did have guidelines!"
However, this evening, Cox tweeted: "As @daraobriain pointed out, we did the "health and safety" aliens story live on air last year as a joke. Not really news!"
Ó Briain also added on Twitter: "Funny to watch story grow about how BBC "banned" us talking to aliens, when actually we did it live on-air during Star-gazing last January"
Stargazing Live will return next year with Cox and Ó Briain at the helm.