Scientists have discovered that on the blue planet are glass showers
Astronomers for the first time in history able to identify the true color of an exoplanet orbiting another star. This planet, which received an astronomical designation HD189733b, dyed in bright blue color, may be the result of the presence of silicates, in its atmosphere. opening Details committed by a space telescope "Hubble", published in the journal Astrophysical Journal Letters. Planet HD189733b is a gas giant larger than Jupiter. It revolves in an elliptical orbit around its star.
The temperature on the surface should reach 1000 degrees Celsius in the atmosphere of the window should go cloudy and the wind speed may be 7000 km / h. In 2007, using data from the telescope "Hubble", the researchers found that there HD189733b misty atmosphere, providing optical effects such as sunrise and sunset. When the planet is between us and the star, its atmosphere takes on a reddish hue.
This is due to the haze in the atmosphere. What exactly it forms the mist, while not precisely known, but preliminary estimates, it should be tiny dust particles (diameter of less than one thousandth of a millimeter) - iron particles, silicates, alumina. This planetary system is located 63 light-years from Earth and is one of the closest to us. It has already been well studied terrestrial and orbital telescopes, and now astronomers were able to determine how the planet looks at optical wavelengths. "The definition of its color is a real achievement - now we can imagine the look of this planet, if we could get to this system," - said Professor Frederic Pont, an astronomer at the University of Exeter.
Not like Earth
Scientists have found that during the passage of a planet across the star drive down the brightness of the entire system in that part of the spectrum, which corresponds to the visible blue color. "On the basis of these observations, we can say that the planet looks blue because the other parts of the spectrum signals remain unchanged," - said one of the authors of the publication, Tom Evans of the University of Oxford.
The Earth looks like a blue planet when seen from orbit due to the fact that the water in the local atmosphere absorbs red and green light waves are stronger than blue. The blue color has a different ekzoplanety explanation - the cause is not the presence of water in the world, and that in its atmosphere sufficiently silicates, ie minerals, containing silicon and reflecting blue... Planet relates to a class of so-called hot Jupiter - gas giant located very close to the central star system. HD189733b period of rotation around the star is less than 2 to 5 days. Probably, the rotation of the planet is synchronized with its orbital motion - a planet always faces the star of one side.