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789
中子星碰撞构想图。
美国雷射干涉重力波天文台(LIGO)与设于意大利的欧洲引力天文台(Virgo)周四(2日)表示,可能首次探测到黑洞与中子星碰撞产生的引力波信号。
两地天文台在上月26日,同时探测到有关信号,并推测信号由约12亿光年外的黑洞和中子星碰撞产生。LIGO发言人布雷迪说,探测到的信号非常微弱,就像在喧闹的咖啡馆中听他人耳语,很难辨别清楚,因此还需要一段时间才能得出确切结论。今次是两间机构首次在捕捉到引力波后,未确定其来源就对外公布。
引力波是由黑洞、中子星等碰撞产生的一种时空涟漪,宛如石头丢进水里产生的波纹。LIGO执行主任赖茨说,如果证实引力波是黑洞吞噬中子星的迹象,将是“三连胜”,意味科学家观察到双黑洞、双中子星以及黑洞与中子星碰撞的3个不同情况。最新的发现,有助研究组成中子星的超稠密物质,以及宇宙膨胀的速度。
自2015年首次探测到引力波以来,两家机构已探测到13次由双黑洞碰撞产生的引力波,两次由双中子星碰撞产生的引力波。LIGO和Virgo近期又升级探测器,于4月1日启动第3轮引力波探测。
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