<strike id="gegfc"><dl id="gegfc"></dl></strike>
<sub id="gegfc"></sub>

    <mark id="gegfc"></mark>

      Milky Way sends out cataclysmic beam 3.5 mln years ago: study

      Source: Xinhua| 2019-10-07 00:37:06|Editor: xuxin
      Video PlayerClose

      WASHINGTON, Oct. 6 (Xinhua) -- Astronomers found that an expanding beam of energy sprang from close to the supermassive black hole in the center of the Milky Way, like a titanic lighthouse beam, more than 3 million years ago.

      The study published on Sunday in the preprint site arxiv.org and to be published soon in The Astrophysical Journal showed that the beam had sent a cone-shaped burst of radiation through both poles of the Galaxy.

      The phenomenon created two enormous ionisation cones that sliced through the Milky Way, starting with a relatively small diameter close to the black hole, and expanding vastly as they exited the Galaxy, according to the study.

      The explosion was too huge to have been triggered by anything other than nuclear activity associated with the black hole, known as Sgr A*, which is about 4.2 million times more massive than the sun, according to the Australian-U.S. research team.

      Using data gathered by NASA's Hubble Space Telescope, the researchers calculated that the massive explosion took place about 3.5 million years ago, which is astonishingly recent in Galactic terms.

      "This shows that the center of the Milky Way is a much more dynamic place than we had previously thought. It is lucky we're not residing there," said Lisa Kewley, director of Australia's ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions.

      The researchers estimated that the blast lasted for perhaps 300,000 years, also an extremely short period in galactic terms.

      "We always thought about our Galaxy as an inactive galaxy, with a not so bright center. These new results instead open the possibility of a complete reinterpretation of its evolution and nature," said the paper's co-author Magda Guglielmo with the University of Sydney.

      TOP STORIES
      EDITOR’S CHOICE
      MOST VIEWED
      EXPLORE XINHUANET
      010020070750000000000000011100001384520291
      中文字幕日韩无线码在线一区_制服肉丝亚洲中文字幕_日韩欧美无砖专区一中文字目_国产精品点击进入在线影院高清
      <strike id="gegfc"><dl id="gegfc"></dl></strike>
      <sub id="gegfc"></sub>
      
      
        <mark id="gegfc"></mark>
          亚洲精品熟女国产国产老熟女 | 在线亚洲激情文学 | 亚洲AⅤ视频一区二区三区 日韩一区二区欧美一区 | 亚洲大乳高潮日本专区无需安装 | 亚洲Aⅴ狠狠爱一区二区三区 | 亚洲欧美日韩人成在线播放 |