Ecns wire

澳门英皇宫殿娱乐平台: Chinese researchers flush out stellar black hole

2019-11-28 16:04:58菲律宾申博官方网址 Editor : Mo Hong'e ECNS App Download
A rendering picture of the huge stellar black hole LB-1. (Photo provided to China News Service) 本文来源:

菲律宾申博官方网址,  另外就是政策风险,目前很多国家正在进行的大选、还有他们的政策调整,对大家在“出海”的时候有很大的影响,尤其是电子商务、金融、社交等领域。我可以还你3000,你太单纯了,我都不好意思要你这么多了。标准化,是零售行业一个重要的原则,货源,价格,品质,以及售后等,这都是衡量零售企业的硬件,在零售电商这里还需要加上配送时间。从总量来看,去产能的就业冲击从总量上看并不突出。


行情12月07日【广西IT前线今日报道】惠普Pavilion14-AL131TX搭载第七代英特尔#174;酷睿i5-7200U处理器,采用KabyLake架构,运用成熟的14纳米工艺,功耗较第六代更低。今年以来,也是更多的钱“南向”流入香港,多于香港“北上”流入上海A股的钱。”  当电商击垮社区零售店时,怡亚通给社区零售店一条更宽的活路。  模式:定位于国内首家专注于95后的青少年个性化电商平台,根据兴趣标签和推荐算法为年轻用户提供高品质高逼格商品。

A rendering picture of the huge stellar black hole LB-1. (Photo provided to China News Service)

(ECNS) - Researchers from National Astronomical Observatories at the Chinese Academy of Sciences have discovered a stellar black hole with a mass 70 times greater than the sun, forcing scientists to re-examine their formation.

All stellar-mass black holes have hitherto been identified by X-rays emitted from gas accreting companion stars [sound better - not sure if it makes more sense..].

Theory predicts, however, that X-ray-emitting systems form a minority of the total population of stellar black-hole binaries. When the black hole is not accreting gas, it can be found through radial-velocity measurements of companion star motion.

Research led by Liu Jifeng and Zhang Haotong revealed radial-velocity measurements taken over two years of the Galactic B-type star, LB-1.

The team said the B star had the presence of a dark companion equivalent to 68 solar masses, which can only be a black hole. The long orbital period of 78.9 days shows that this is a wide binary system.

Gravitational-wave experiments have detected black holes of similar mass, but their formation in a high-metallicity environment would be extremely challenging within current stellar evolution theories. As a result, this finding is of great importance, according to researchers.

The work was only made possible with LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope), a National Major Scientific Project built by the Chinese Academy of Sciences, it was noted.

This work is partly based on observations made with tGran Telescopio Canarias (GTC), installed in Spain. Part of the data was obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, University of California and National Aeronautics and Space Administration.

The finding was published in the academic journal Nature.

Related news


Most popular in 24h

MoreTop news


Back to top Links | About Us | Jobs | Contact Us | Privacy Policy
Copyright ©1999-2019 All rights reserved.
Reproduction in whole or in part without permission is prohibited.
旧版太阳城申博直营网 申博手机版下载网址 菲律宾太阳网城上娱乐 申博管理网网址 菲律宾申博代理开户合作 申博代理开户合作登入
菲律宾申博游戏 申博官方网址 申博游戏登录直营网 申博怎么开户 申博最新网址 申博会员登入直营网 百家乐手机版登入网址 菲律宾申博游戏登入 申博游戏桌面下载官网 申博开户 申博手机版下载客户端直营网