LYNETTE COOK / SCIENCE PHOTO LIBRARY LYNETTE COOK / SCIENCE PHOTO LIBRARY
Alien planet. Artwork of the Tau Bootes b planet (at lower left) which orbits the Tau Bootes star (at upper right). The mass of this planet is at least 3.87 times that of Jupiter. This Jupiter- like planet orbits its star once every 3.3 days. This planet was discovered by Geoff Marcy and Paul Butler.
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