Baku, December 25, AZERTAC
UK astronaut Tim Peake has tweeted a light-hearted apology after dialling a wrong number from space and saying to a woman on the other end of the line: "Hello, is this planet Earth?", according to the BBC.
Mr Peake said on Twitter it was not intended to be a "prank call".
The astronaut, a father-of-two from Chichester, West Sussex, arrived at the International Space Station (ISS) on Tuesday 15 December.
He is spending six months conducting scientific experiments on the station.
He later tweeted a picture of a Stoke City FC flag in the space station.
Lifelong Potters fan Andrew Rushton had persuaded Mr Peake to pack the emblem, which went up in a supply ship earlier in December.
Mr Peake tweeted: "Happy Christmas @jollyhappybore - you did it!"
Mr Peake, who is a former major in the Army, is the first Briton to join the crew of the ISS and is employed by the European Space Agency.