Artwork of a 51 Pegasi B size comparison.

Artwork of a 51 Pegasi B size comparison.

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Caption: 51 Pegasi B. Artist's comparison of the size of the planet 51 Pegasi B (at lower right) with its star, 51 Pegasi (at upper left), and the planets of Jupiter and Earth (at lower right). 51 Pegasi B is red, Jupiter has orange and white bands, Earth is blue. 51 Pegasus B is 1/10 the diameter of its sun, 1/2 the mass of Jupiter and 159 times more massive than Earth. This planet was discovered in 1995 by Michel Mayor and Didier Queloz of Geneva Observatory, Italy. The star is a Sun-like star some 42 light years from Earth. The planet orbits only 7 million km from the star, equivalent to 1/6th of Mercury's orbit around the Sun. The surface temperature is probably over 1000 Celsius.

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Keywords: 51 pegasi b, 51 pegasus b comparison, 51 pegasus b comparsn, alien planetary system, artwork, astronomy, cosmology, earth, jupiter, pegasi b, planet, science

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