The Australian National University (ANU) is launching a search for a new planet in our Solar System, inviting anyone around the world with access to the Internet to help make the historic discovery.
Anyone who helps find the so-called Planet 9 will work with ANU astronomers to validate the discovery through the International Astronomical Union.
ANU astrophysicist Dr Brad Tucker is leading the project, which is being launched by Professor Brian Cox during a BBC Stargazing Live broadcast from the ANU Siding Spring Observatory.