综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

Australian astronomers say have pinpointed an area of the Milky Way that is most likely to support alien life.

Australian astronomers say they have pinpointed an area of the Milky Way that is most likely to support alien life. Here a 'star nursery' [AFP]

"Our Milky Way galaxy is home to hundreds of billions of stars, but until recently astronomers could only guess as to how many are hospitable for the development of complex life," Charles Lineweaver, from University of New South Wales, said in a statement.

"What we have done for the first time is to quantify carefully where complex life is likely to exist."

Lineweaver and Swinburne University of Technology colleagues Yeshe Fenner and Brad Gibson, in a paper published in the journal "Science", say hundreds of stars capable of supporting life are visible from Earth by the naked eye.

"A few billion stars out there sit in what we call the Galactic Habitable Zone where they have the appropriate conditions to support complex life," Gibson said.

"Many, many hundreds of those stars which you could look up and see with the naked eye, most of which are actually very close, would potentially have terrestrial planets similar to the earth and Mars and Venus."

Gibson said the habitable zone appeared about eight billion years ago but had since accumulated heavy elements like carbon, oxygen and iron.

"Perhaps there's no life out there," Lineweaver said. "But if there is life, we've determined where you are most likely to find it."

Close

Today's Top News		Top Lifestyle News
+Patient may be infected with SARS variation ( 2004-01-03) +China praised on suspected SARS response ( 2004-01-03) +Virus variation found in suspected SARS case ( 2004-01-02) +Gene test for SARS unclear ( 2004-01-02) +Negligence blamed for gas blowout ( 2004-01-02)		+Marilyn Monroe's first husband recounts romance ( 2004-01-02) +People of 2003,an event-packed year ( 2004-01-02) +Australian astronomers identify possible cradle of alien life ( 2004-01-03) +North China city opens reading room for the blind ( 2004-01-03) +Valuable oracle bones unearthed in NW China ( 2004-01-03)