description HD 189733 b Overview
About 63 light-years away, HD 189733 b is a hot gas giant orbiting a star smaller and cooler than the Sun. Repeated transits make it a useful subject for atmospheric research, because observers can examine changes in starlight as the planet passes in front of its host. Its atmosphere has been studied in considerable detail for a world beyond the solar system. A blue appearance does not indicate an Earth-like ocean.
Observations link the colour to scattering by atmospheric particles, including silicate haze, while studies of its heat distribution investigate extreme weather and winds. Claims about specific materials must distinguish observations from atmospheric interpretations. The planet interests researchers studying giant-planet formation and interactions with stellar radiation and winds. NASA's account explains the evidence connecting its blue colour with silicate particles.
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What is the weather like on the exoplanet HD 189733 b?
HD 189733 b is known for its extreme, terrifying weather, featuring winds that blow sideways at up to 5,400 mph. Deep blue in color, its atmosphere is also famous for raining molten glass due to its scorching temperatures.
How far away is HD 189733 b from Earth?
This gas giant exoplanet is located approximately 64 light-years away from Earth. This relatively close distance in astronomical terms makes it one of the most extensively studied exoplanets to date.
How did scientists discover water on HD 189733 b?
Astronomers detected water vapor in the planet's atmosphere using the Hubble Space Telescope to observe its transit across its host star. They analyzed the starlight as it filtered through the planet's atmospheric gases to identify the molecular signatures.
Could HD 189733 b support human life?
No, HD 189733 b is classified as a 'hot Jupiter' that orbits incredibly close to its star, completing an orbit in just over two Earth days. The extreme heat, high radiation, and violently fast winds make it entirely inhospitable to any known form of life.
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