"The earth is no longer lonely"! Let the United States media so glad is: the United States National Aeronautics and Space Administration (NASA) announced in April 18th, the Kepler telescope has detected two extrasolar so "most like the earth, may be the most suitable for human habitation" planet, "a gentle as a cold Hawaii, such as Alaska", 1200 light-years from earth. On the same day, another NASA team also announced the discovery of another planet, "livable planet farther afield". American officials say, these findings enable "humanity to find similar homes and the last step". British "Daily Mail" 19 journal article hail human found "earth two" and "earth three". But there is also a media questioned, thousands of light-years from earth to the planet even "livable", human beings are unlikely to really move.
The day the new discovery was published in 18 "science" magazine web site. Research report said, in a Kepler -62 planetary systems "habitable zone" found in the two planet, where temperature conditions are suitable, liquid water on its surface. The theory, there is a little atmosphere, and even the possibility of life. Boruch chief scientist NASA Kepler Telescope project said: "this is we found so far the most habitable planets in space", in the "habitable zone" means they surface might have liquid water, and water is a necessary condition for the existence of life. If the planet distance too close to the sun, above the temperature is too high, the sea may boil; if too far, the ocean will be frozen. These two conditions are not suitable for life.
"The right size, position," the associated press 19, issued a document called the Kepler -62 planetary system, about 1200 light-years from earth, in the constellation lyra. In this system, the 5 planet orbits a star a smaller than the sun, more cold, more old, Kepler -62e and Kepler -62f is the most peripheral two, their volume were 1.6 times and 1.4 times of the earth, heat radiation is just the earth 1.2 times and 0.4 times, orbital period of 122 days and 267 days respectively. Germany's Marx Planck Institute for astronomy, scientists say, Kepler -62e temperature "may be like in Washington in May". Researchers speculated that, these two planets is mainly composed of rock and ice, only after obtaining relevant atmospheric spectral characteristics, to see whether they really "livable", "if there is life, must be very high". Another "new earth" Kepler -69c at Kepler -69 planetary system, in Cygnus, approximately 2700 light-years from earth, the volume is 1.7 times that of the earth, orbital period of 242 days, material composition is uncertain. In addition, the two planetary systems of the remaining 4 planet's orbital period only 10 days, means that they are very hot, not suitable for human survival.
The associated press said, these findings give scientists think, similar livable planet widely exist in the universe. The Kepler space telescope can simultaneously and continuously measuring the light over 150000 stars, is the first NASA has the ability to detect around sun-like stars Earth-size planets telescope. In 4 years tracking the earth's orbit, the Kepler telescope has discovered 122 extrasolar planets in the outer solar system, but these planets are not in the habitable zone, not consistent with the existence of human and biological conditions, few in the habitable zone of the planetary volume is too large (such as 2.4 times the volume of Kepler 22-b and 5 times that of earth the volume of the Kepler 49-c), or the same as the Neptune atmospheric pressure. The new discovery of Kepler -62e and Kepler -62f as "fraternal twins", around the same star, adjacent to each other, the ratio of the distance between earth and Mars closer neighbors.
In many Western media hailed the "new earth" discovery "has milepost sense", also public opinion questioned. The United States "times" weekly 18 journal article said, some experts said, "livable" does not mean that the biological, ecological circle of the earth is produced by a variety of factors. There are views that, new found "livable planet" 1200 light years from earth, even if there is really suitable for living, human beings could not reach. The United States National Broadcasting Company 18 questions: in the search for extraterrestrial life, whether humans are wrong? The article said, astrobiology conference in England where the most suitable for life started over a year of debate, some scientists say, solar system more extensive potential life, such as satellite Europa and Saturn and Jupiter's moon six, but has not been studied first.