The silica particles swept along by HD 189773b's harsh winds may form glass, and could even be responsible for the planet's azure color. TrES-2b, on the other hand, appears blacker than both coal and black acrylic paint. Scientists aren't entirely sure why the planet reflects less than 1% of the light that hits it, but theorize that chemicals in its atmosphere might absorb the light.
Some Of The Strangest Exoplanets In Space
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Key Facts In This Video
On HD 189773b, winds propel particles of silicate around the planet at up to 7,000 km/hr (4,350 mph). 01:02
The planet HAT-P-7b orbits its star in the opposite direction of most planets. 02:16
TrES-2b reflects only 1% of the light that hits it. 04:08
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