Recently, astronomers and biologists jointly published a color illustrations, is expected to help the human search for extraterrestrial life.
Beijing March 19, according to foreign media reports, recently, astronomers and biologists jointly published a color illustrations, is expected to help the human search for extraterrestrial life.
The illustrations of different colors represent the 137 kinds of chemical properties of microorganisms.Sample selection of microorganisms, some from the most extreme conditions on earth region. If a large number of similar life forms exist on a planet outside our solar system, we may be able to find extraterrestrial life, according to the wavelength of the reflected light.
And conversely, if someone overlooking the Earth from other planets, due to the Earth’s surface covered by vegetation, observed the planet should be green. The reason why you can carry out photosynthesis in green plants, because they will absorb other wavelengths of visible light, visible only green plants will be reflected back.
Heidelberg, Germany, Max Planck Institute for Astronomy (Max Planck Institute for Astronomy) of 希达斯 · Hatch (Siddharth Hegde) led a research team, and the findings published in the PNAS. The paper wrote: “an album encompasses a lot to prove the existence of a planetary surface features of life on extrasolar planets, and these planets and the Earth’s environment is far if life exists on the planet, it is likely to be the same as on Earth. extremophiles dominant. ”
“Earth since life appeared since, most of the time by microorganisms predominant position. Extrasolar planets may be from single-celled organisms such as start, and then slowly transition to multi-cellular organisms.”
After “In this article, we use the acquired information to establish a database for the first time. Next Generation Space Telescope and other ground-based telescopes and space exploration applied, they can refer to the planet’s surface characteristics described in our database, and is expected to find more accordingly kinds of extraterrestrial life. ”
Currently, astronomers have discovered a 2000 very distant planet from Earth. Some planet in the “habitable zone”, that is the planet’s surface conditions are mild, liquid water can exist, and may even exist on Earth-like life forms.
In the next stage of the study of extrasolar planets, people will explore their atmospheric composition, as well as from the reflected light to determine whether there are signs of life on the planet.
In addition to the direct biological evidence, some of life is also a byproduct of the process to produce concern, such as ozone and methane. But scientists believe that if we can find the surface of the planet similar to Earth’s green, the existence of extraterrestrial life will provide more direct evidence. If some kind of extraterrestrial life covering a large area of the planet, we can determine the color of the surface of the planet, the existence of extraterrestrial life on the planet.
137 kinds of microbes color samples used in this study varied and very wide distribution range. These colors including magenta, yellow, pink, green and brown. The researchers plan to re-collect some samples, and to increase the color atlas more life forms.
But these scientists have pointed out that in order to use this method to determine whether there is life on extrasolar planets, it is very difficult. At present, we can not directly measure a extrasolar planets the size of Earth reflected light, because compared to other bright stars, which light emitted by the planet is too dim.
The scientists also said: “People are free to use our established database, which is used as input data model build rocky planets when it will show its mettle in the human observer in outer space to help mankind discover extrasolar planets. the possible existence of a variety of extraterrestrial life. ”