The answer depends on several factors, including how you define a planet. Even so, there are a few candidates for the largest known planet. One of the largest is called ROXs 42Bb, a gas giant orbiting a star about 460 light-years from Earth. It is about nine times the mass of Jupiter and has a radius of about 2.5 that of Jupiter.
Thayne Currie, an associate professor of physics and astronomy at the University of Texas — San Antonio, told Space.com he thinks it's unlikely that this planet is truly the largest known. Currie identified ROXs 42Bb from data from the Keck Space Telescope in 2013 (another group independently identified the object around the same time). There are known objects around the same size as this exoplanet and even larger, Currie continued.
Source: www.space.com
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