TrES-2b

 TrES-2b / Kepler-1b

TrES-2b or Kepler-1b is an extrasolar planet orbiting the star GSC 03549-02811 located 750 light years away The planet has been identified in 2011 as the darkest known exoplanet, reflecting less than 1% of sunlight. It is darker than any planet or moon in our solar system. It is not clear why the planet is so dark. One reason might be a lack of reflective clouds like those that make brilliant Jupiter, due to the proximity TrES-2b to its parent star and therefore high temperature. Another reason could be the presence in the atmosphere of chemicals that absorb light such as sodium vaporized titanium oxide or potassium gas.