Astronomers European Space Agency (ESA) analysis made by Orbital apparatus Venus Express, applying around Venus, a selection of images of the Earth and found that reliably identify with them through the presence of life on Earth is not yet possible. The presence of water and oxygen in itself is not yet talking about obitaemosti planet, and discern any details on the surface it is impossible to use the tools.
At pictures of the Earth appears as a single pixel - and therefore the only source of information is a reflection spectrum of the world, just as is the case with the observation of planets outside the solar system. Habitability which, unlike Earth, has not yet been proved.
According to David Grinspuna, American astrobiology serving in the Venus Express, people "want to know what can be said about the existence of life on Earth, on the basis of such observations. What we learn now that can be applied in the monitoring of other worlds." Currently, researchers are analyzing the spectra, not only in search of water and oxygen, but also trying to detect traces of photosynthetic activity on the surface of the planet. Terrestrial plants are well reflected light at near-infrared range, but whether this method is reliable and versatile for plants that may have a different color - still an open question.
вторник, 14 октября 2008 г.
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