A star called Alpha Draconis and its companion star orbit each other every 51.4 days. NASA's Transiting Exoplanet Survey Satellite (TESS) has been used to discover that it is an eclipsing binary system. Story: Ancient North Star Thuban Eclipses Its Stellar Companion (Video) TESS: NASA's Search for Earth-Like Planets:
Credit: NASA's Goddard Space Flight Center/Chris Smith (USRA)
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