The terms extrasolar or exoplanets refer to any planet outside the solar system and orbits a star other than the Sun. The planet may travel through the galaxy freely without orbiting a star, like the one recently found.
While most of the rogue planets have been observed to orbit a star, there are exceptions.A few years ago, Polish astronomers from the Astronomical Observatory of the University of Warsaw discovered one of these planets.
Publishing their observations in Astrophysical Journal Letters, they announced the existence of the smallest free-floating planet ever discovered in the Milky Way.
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