www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

   

US astronomers find a hole in the universe

(AP)
Updated: 2007-08-25 10:36

WASHINGTON - American astronomers have stumbled upon a tremendous hole in the universe. That's got them scratching their heads about what's just not there.

The cosmic blank spot has no stray stars, no galaxies, no sucking black holes, not even mysterious dark matter. It is 1 billion light years across of nothing. That's an expanse of nearly 6 billion trillion miles of emptiness, a University of Minnesota team announced Thursday.

Galaxies in deep space are seen in a 2005 handout photo from NASA. A giant hole in the Universe is devoid of galaxies, stars and even lacks dark matter, astronomers said on Thursday. (NASA/Handout/Reuters)

Astronomers have known for many years that there are patches in the universe where nobody's home. In fact, one such place is practically a neighbor, a mere 2 million light years away. But what the Minnesota team discovered, using two different types of astronomical observations, is a void that's far bigger than scientists ever imagined.

"This is 1,000 times the volume of what we sort of expected to see in terms of a typical void," said Minnesota astronomy professor Lawrence Rudnick, author of the paper that will be published in Astrophysical Journal. "It's not clear that we have the right word yet ... This is too much of a surprise."

Rudnick was examining a sky survey from the National Radio Astronomy Observatory, which essentially takes radio pictures of a broad expanse of the universe. But one area of the universe had radio pictures indicating there was up to 45 percent less matter in that region, Rudnick said.

The rest of the matter in the radio pictures can be explained as stars and other cosmic structures between here and the void, which is about 5 to 10 billion light years away.

Rudnick then checked observations of cosmic microwave background radiation and found a cold spot. The only explanation, Rudnick said, is it's empty of matter.

It could also be a statistical freak of nature, but that's probably less likely than a giant void, said James Condon, an astronomer at the National Radio Astronomy Observatory. He wasn't part of Rudnick's team but is following up on the research.

"It looks like something to be taken seriously," said Brent Tully, a University of Hawaii astronomer who wasn't part of this research but studies the void closer to Earth.

Tully said astronomers may eventually find a few cosmic structures in the void, but it would still be nearly empty.

Holes in the universe probably occur when the gravity from areas with bigger mass pull matter from less dense areas, Tully said. After 13 billion years "they are losing out in the battle to where there are larger concentrations of matter," he said.

Retired NASA astronomer Steve Maran said of the discovery: "This is incredibly important for something where there is nothing to it."



Top World News  
Today's Top News  
Most Commented/Read Stories in 48 Hours
主站蜘蛛池模板: 久草在线视频免费看 | 91精品一区国产高清在线 | 中文字幕在线视频在线看 | 久久99国产乱子伦精品免费 | 天堂亚洲网 | 国产精品亚洲精品不卡 | 91久久亚洲精品一区二区 | 毛片a级三毛片免费播放 | 日韩 亚洲 制服 欧美 综合 | 亚洲精品视频专区 | 国产成人a一区二区 | 亚洲国产中文字幕 | 成人毛片免费视频播放 | a级毛片在线视频免费观看 a级免费 | 日韩一区二区三区视频 | 欧美一级专区免费大片俄罗斯 | 欧美在线综合 | 久久亚洲综合中文字幕 | 亚洲欧美一区二区三区久久 | 国产精品一级香蕉一区 | 女人张开腿让男人桶免费最新 | 人成在线免费视频 | 成人欧美精品一区二区不卡 | 日产国产精品亚洲系列 | 亚洲精品免费观看 | 韩国自拍偷自拍亚洲精品 | 在线一级片 | 欧美日产国产亚洲综合图区一 | 嫩草影院在线观看网站成人 | 男女那个视频免费 | 免费香蕉成视频成人网 | 久久精品国产影库免费看 | 久久久久成人精品一区二区 | 国产91久久最新观看地址 | 美女扒开腿让男生桶爽网站 | 欧美大片一区 | 91成人爽a毛片一区二区 | 日本波多野结衣在线 | 亚洲天堂男人 | 亚欧精品一区二区三区 | 黄色网点|