NASA wants you to help find undiscovered worlds. They've created a new website called Backyard Worlds: Planet 9. The way it works is, you watch brief movies made from images captured by NASA's Wide-field Infrared Survey Explorer (WISE) mission. The movies highlight objects that have gradually moved across the sky.

"If Planet Nine -- also known as Planet X -- exists and is as bright as some predictions, it could show up in WISE data." "The search also may discover more distant objects like brown dwarfs, sometimes called failed stars, in nearby interstellar space."

"Unlike more distant objects, those in or closer to the solar system appear to move across the sky at different rates. The best way to discover them is through a systematic search of moving objects in WISE images. While parts of this search can be done by computers, machines are often overwhelmed by image artifacts, especially in crowded parts of the sky. These include brightness spikes associated with star images and blurry blobs caused by light scattered inside WISE's instruments. Backyard Worlds: Planet 9 relies on human eyes because we easily recognize the important moving objects while ignoring the artifacts."
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