However, the existence of Planet 9 is still being debated, and this new project is the latest attempt to see if it does indeed exist.
“Automated searches don’t work well in some regions of the sky, like the plane of the Milky Way Galaxy, because there are too many stars, which confuses the search algorithm,” says physicist Aaron Meisner, who specialises in analysing WISE images.
“Using the powerful ability of the human brain to recognise motion may be luckier.”
WISE’s infrared images cover the whole of the sky six times over, and have already discovered hundreds of previously unknown brown dwarfs.
The data is now being presented so that citizen scientists can spot faint, moving objects and note them for further investigation by professional astronomers.