As of yesterday, Mr Pegman's composite photo had been viewed more than 2.18 million times on Imgur alone.
It also sparked debate about whether the image had been Photoshopped (it has) and whether it would be possible to create the image without Photoshop (the verdict was that it might be, but it would require an incredible amount of planning.)
Mr Pegman was delighted it had proved so popular and is now "chasing his tail" trying to attach his name to an image that was continuing to multiply across the internet.
It showed that anything posted online was liable to be stolen, he said.
"I was just having fun ... I didn't realise the gem I'd created."
The radio telescope image was taken on a Canon 6D with a 24m lens and consists of three photos stitched together. The supermoon was shot with a 70-200mm lens.
Step-by-step guide to creating an internet sensation