In 1781, astronomer Sir William Herschel spotted an object moving in the sky and originally thought it was a comet but later realized its planetary nature.
'Most planetary scientists would not be surprised if the largest undiscovered companion was Neptune-sized or smaller, but a Jupiter-mass object would be a surprise, ' Matese told SPACE.com
The structure and characteristic of different kinds of planetary gear train is briefly analyzed, based on this, Ravigneavx AT is selected as the research object.