NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Exoplanet. Computer artwork of the giant planet HR 8799b (centre) with a star in the distance (upper right). HR 8799b is outside our solar system (exoplanet) and was first discovered in 2007. It is young and hot, with a temperature of 815 degrees Celsius. It is slightly larger than Jupiter and may be at least seven times more massive. Data suggests the planet has water vapour in its atmosphere and is only partially cloud covered. It is not known if the planet has rings or moons.
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