HD 189733b has the distinction of being among a peculiar class of planets called “hot Jupiters,” which orbit perilously close to their parent stars.
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According to a July 11 news release from NASA’s Goddard Space Flight Center (GSFC), astronomers using the space agency’s Hubble Space Telescope to make visible-light observations of exoplanet HD 189733b have concluded that the true color of the celestial body is blue. The exoplanet orbits a star (HD 189733b) 63 light-years from Earth, and according to NASA scientists, it is one of the closest exoplanets that can be observed crossing the face of its parent star.
The Imaging Spectrograph onboard the Hubble Space Telescope observed and measured the changes in the color of the light from the planet before, during, and after it passed behind its parent star. Due to changes in light intensity and a slight change in color, the astronomers built a solid case for concluding what color the planet actually is.