Professor Brian Cox lived out a lifelong dream this week when he guest starred in the beloved series Postman Pat. The particle physics expert stopped by Greendale to help Postman Pat try to reach his goal of becoming an astronaut. Who better to call in than the presenter of Stargazing Live? Actually, the scientist got to do a bit of acting playing Professor Farrow as he tried to recreate the surface of the moon for our favourite Postman. Shortly after the episode aired on CBeebies on Wednesday morning (March 29), Professor Cox beamed on Twitter that working on Postman Pat had been a "career highlight". This content is imported from Twitter. You may be able to find the same content in another format, or you may be able to find more information, at their web site. A career highlight :-) https://t.co/ROTbZoef4q — Brian Cox (@ProfBrianCox) March 29, 2017

High praise coming from a man who lectures the world over on theoretical physicists, guides us through the universe on Stargazing Live and has even travelled time and space with The Doctor.

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Now that our friendly neighbourhood postman has managed to reach the stars (well, basically), hopefully he calls in Jeremy Kyle next to help him get to the bottom of his serial shagging.

Postman Pat has been a staple of UK TV for decades, having debuted on the BBC all the way back in 1981.

The stop-motion animated classic has spawned numerous children's books, toys and even a big screen adventure starring Jim Broadbent, former Doctor Who actor David Tennant, Harry Potter's Rupert Grint and even Boyzone singer Ronan Keating.

Now enjoy the show's classic theme song:

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