三级aa视频在线观看-三级国产-三级国产精品一区二区-三级国产三级在线-三级国产在线

US EUROPE AFRICA ASIA 中文
World / US and Canada

Astronomers find possibly biggest black hole ever

(Xinhua) Updated: 2012-11-30 10:10

HOUSTON - US astronomers have discovered what may be the most massive black hole ever known in a small galaxy about 250 million light-years from Earth, US media reported Thursday.

Astronomers find possibly biggest black hole ever

Undated composite image courtesy of NASA shows the most distant X-ray jet from a quasar named GB 1428+4217 located 12.4 billion light years from Earth. X-ray data from NASA's Chandra X-ray Observatory is shown in blue, radio data from the NSF's Very Large Array are shown in purple and optical data from NASA's Hubble Space Telescope are shown in yellow. Giant black holes at the centers of galaxies can pull in matter at a rapid rate producing the quasar phenomenon. The researchers believe the length of the jet in GB 1428 is at least 230,000 light years, or about twice the diameter of the entire Milky Way galaxy.?[Photo/Agencies]

According to observations made with the University of Texas at Austin's Hobby-Eberly Telescope, the giant black hole discovered is 11 times wider than Neptune's orbit around the sun, or about 4, 000 times larger than the black hole at the heart of the Milky Way, according to the newspaper The Houston Chronicle.

"This is a really oddball galaxy," said study team member Karl Gebhardt of the University of Texas at Austin. "It's almost all black hole. This could be the first object in a new class of galaxy-black hole systems."

The mass is so far above normal that the scientists took a year to double-check and submit their research paper for publication, according to the study's lead author, Remco van den Bosch.

Scientists now are intrigued not so much by the black hole's size, but where it lies, according to the report.

The black hole rests in the center of a disk-shaped galaxy smaller than our own Milky Way, surprising scientists who didn't figure to find something that big in a modestly sized galaxy.

The newly discovered black hole has a mass equivalent to 17 billion suns and is located inside the galaxy NGC 1277 in the constellation Perseus. It makes up about 14 percent of its host galaxy's mass, compared with the 0.1 percent a normal black hole would represent, scientists said.

"We don't understand how to make such a massive black hole in such a puny galaxy," said Karl Gebhardt, one of the University of Texas astronomers who made the discovery.

Scientists have several theories that help explain the relationship between the size of a black hole and its host galaxy.

"We do not understand yet which of these theories is best," said Remco van den Bosch.

A black hole is a region of spacetime where gravity prevents anything, including light, from escaping. Understanding the nature of black holes and their host galaxies is important because astronomers would like to better know how galaxies form and evolve.


 

Trudeau visits Sina Weibo
May gets little gasp as EU extends deadline for sufficient progress in Brexit talks
Ethiopian FM urges strengthened Ethiopia-China ties
Yemen's ex-president Saleh, relatives killed by Houthis
Most Popular
Hot Topics

...
主站蜘蛛池模板: 日本一级毛片免费完整视频2020 | 97视频精品 | 日韩午夜高清福利片在线观看 | 免费一级欧美片片线观看 | 国产精品极品 | 久久亚洲福利 | 黄色三级毛片视频 | 国产一区二区三区在线观看免费 | www.av网| 欧美曰b| 国产精品亚洲第一区广西莫菁 | 91麻豆免费观看 | 亚州精品视频 | 免费看影片的网站入口 | 欧洲成人全免费视频网站 | 愉拍自拍 | 亚洲色图视频在线 | 青草青视频在线观看 | 哪里可以免费看毛片 | 国产青草视频 | 91短视频在线观看免费最新91 | 国产精品久久久久一区二区三区 | 国产精品成人影院 | 成人黄色三级视频 | 在线观看国产一区亚洲bd | 久久国产自偷自免费一区100 | 欧美a级在线观看 | 成人三级精品视频在线观看 | 欧美日韩在线视频不卡一区二区三区 | 91久久线看在观草草青青 | 亚洲人人爱| 极色影院| 成人在线不卡视频 | 美国免费一级片 | 婷婷丁香色综合狠狠色 | 九九在线观看免费视频 | 免费一级淫片aa | 亚洲第一视频网站 | 成年女人免费v片 | 亚洲欧洲精品成人久久曰影片 | 成人性视屏 |