久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Global EditionASIA 中文雙語Fran?ais
Opinion
Home / Opinion / Op-Ed Contributors

Radio signals unlikely to be extragalactic aliens saying 'hi'

chinadaily.com.cn | Updated: 2019-01-11 20:00
Share
Share - WeChat

Gou Lijun, a research professor at the National Astronomical Observatories, Chinese Academy of Sciences

Fast Radio Bursts are a rather new concept in astronomical studies. It was discovered by accident in 2007 from the SMC archival data by Professor Duncan Lorimer at West Virginia University. Afterwards, within the following five years astronomers did not detect any more, and started to doubt their existence. Until 2012, when another FRB was finally observed, the doubt finally disappeared. Although dozens of events have been observed, astronomers still have no idea about the cause of the events.

Yuan Lanfeng, an associate professor at University of Science and Technology of China

On micro blogs and other social media platforms, readers have been associating the signal with the famous science fiction The Three-body Problem, in which the Earth replied to a signal from the space and faced the threat of invasion from the latter. That's why many readers jokingly write "Don't answer!" three times on micro blog, which is a famous scenario of the novel.

Their concern is understandable. However, even if you hope to answer the signal, there is no way of doing that with our current technology.

Yu Jun, a senior editor on space at pop-science website guokr.com

The long distance means a high attenuation rate. In other words, the burst at the origin of the signal must be extremely powerful so that we can receive it. There is no way to calculate the exact amount of energy needed this time, but we can compare it to the sun: It is like bursting out the energy radiated by the sun for dozens to tens of thousands of years within 0.01 second.

Since the discovery of the first FRB in 2007, humans have only observed about 60 of them. As a result of insufficient observation data, there is no confirmed theory on what phenomenon produced them.

However, considering the extremely high amount of energy they need, the number of "suspects" is limited, too. According to existing theories, there are at least several possible causes of FRBs, such as the merging of black holes or neutron stars, hyperflares of magnetars, especially energetic supernova, or the collapse of the magnetospheres of Kerr–Newman black holes.

Strictly speaking, the possibility of a super extraterrestrial civilization sending such a signal cannot be excluded, but the possibility is really low considering the high amount of energy needed. Besides, there is no evidence leading specifically to this possibility. So there is no need to exaggerate it.

|<< Previous 1 2   
Most Viewed in 24 Hours
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 男人好大好硬好爽免费视频 | 色拍拍在精品视频69影院在线 | 欧美日韩性视频一区二区三区 | 国产精品久久久久久久毛片 | 国产精品情人露脸在线观看 | 最新中文字幕乱码在线 | 日本免费的一级绿象 | 欧美日韩国产综合一区二区三区 | 欧美一级大尺度毛片 | 在线观看国产一区二三区 | 国产一区二区三区免费观看 | 69交性视频 | 国产综合视频在线观看一区 | 久久久精品在线观看 | 国产精品久久免费观看 | 一级做a毛片在线看 | 国产精品自在线 | 国产成人a在一区线观看高清 | 澳门毛片在线播放 | 一本色道久久88亚洲综合 | 欧美高清免费精品国产自 | 一级香蕉免费毛片 | 欧美一级淫片免费播放口 | 国产精品手机在线播放 | 久草视频在线资源 | 亚洲a成人| 国产综合视频在线观看一区 | 91久久99久91天天拍拍 | 欧美韩国日本在线 | 国产综合在线视频 | 国产欧美日韩综合精品一区二区 | 亚洲精品国产啊女成拍色拍 | 成人爽爽大片在线观看 | 免费一级肉体全黄毛片高清 | 精品国产香蕉伊思人在线 | 国产网址在线 | 韩日一区二区 | 国产精品夫妇久久 | 免费观看成年人视频 | 免费国产精品视频 | 国产手机视频 |