日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

   

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: 一区二区视 | 亚洲男人天堂2018 | av在线免费播放网站 | 在线免费观看中文字幕 | 日韩中文字幕av | 成人午夜毛片 | 亚洲精品1| 奇米第四色7777 | 欧美 日韩 中文字幕 | 69天堂网| 深夜福利一区二区三区 | 一区二区三区四区在线 | 精品国产乱码久久久久久久 | 91精品综合| hd亚洲| 日韩欧美国产一区二区三区 | 国产精久久久久 | jizzjizz日本人 | 黄色一级免费网站 | 成年人免费看毛片 | 欧美a级免费 | av一区在线观看 | 在线观看免费黄色片 | 91高清免费| 911看片| 亚洲欧美日韩成人在线 | 国产成人在线网站 | 亚洲天堂自拍 | 精品动漫一区 | 人人亚洲| 永久看看免费大片 | 成人精品久久 | 国产一区二区三区视频免费观看 | 国产精品视频第一页 | 热久久免费 | 糖心在线视频 | 卡一卡二av | 国产伦精品一区二区三区四区视频 | 日韩精品在线观看免费 | 黄色免费在线观看视频 | 亚洲一区二区三区在线观看视频 |