Astronomers have been hunting for Planet Nine - the large, mysterious body thought to lurk at the edge of our solar system - ever since researchers at Caltech published evidence of its existence last year. Ordinary people have now joined the search. And they've made some intriguing finds. Participants in a citizen science campaign hosted by the crowdsourcing program Zooniverse, and the BBC pinpointed four previously unknown objects in the outer solar system that could be candidates for Planet Nine, according to researchers at the Australian National University. Through the project, dubbed "Planet 9 Search," space enthusiasts and astronomers alike were given access to thousands of images taken by ANU's SkyMapper telescope. Their task was to find anything that appears to move against the mostly motionless background of distant stars. This is how astronomers have looked for new solar system bodies for hundreds of years. In just three days, about 21,000 volunteers sifted through more than