In the search for Earth-like planets, astronomers uncover a strange blue world.
Scientists estimate more than 100 billion planets exist beyond our solar system. These alien worlds, known as exoplanets, orbit distant stars located light-years from Earth. One such planet is called HD 189733b. A gas giant slightly larger than Jupiter, HD 189733b circles its star from a distance of only 3 million miles. That's 13 times closer than Mercury is to our sun. As a result, temperatures in its atmosphere approach 2,000°F. Astronomers discovered HD 189733b in 2005 after observing its parent star dimming with every pass, or transit, of the planet. We now know from follow-up observations by NASA’s Hubble Space Telescope that HD 189733b is blue in color. Watch the video to learn more.
Please give credit for this item to: Science@NASA and NASA's Goddard Space Flight Center Cover image courtesy of NASA/CXC/M. Weiss Video courtesy of Science@NASA HD 189733b illustration courtesy of NASA/ESA/M. Kornmesser Exoplanets image courtesy of Fermilab Center for Particle Astrophysics/J. Steffen
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