Gliese 436 b is one of the closest known exoplanets at a distance of about 30 light years away from the Earth. Gliese 436 b /ˈɡliːzə/ (sometimes called GJ 436 b) is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436. The "hot ice world" is about 30 light-years from the sun. By contrast, Mercury, the innermost planet in our solar system, is 29 million miles (47 million kilometers) from the sun at its closest approach. This exoplanet is about the size of Neptune, and is a mere 2.5 million miles away from its respective star, Gliese 436. For reference, Mercury is a staggering 35 million miles from the sun. Gliese 436 b is known to be one of the smallest exoplanets (planets that exist outside the solar system), with a mass and radius very close to those of Neptune, as was discovered by R. Paul Butler and Geoffrey Marcy in 2004. The planet, called GJ 436 b, orbits a cool, red star at a distance of only 2.5 million miles (4 million kilometers). It was the first hot Neptune discovered with certainty (in 2007) and was among the smallest known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries started coming in by 2010.

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