外太空不斷傳來神秘信號
Researchers just announced the discovery of radio signals from beyond our galaxy that are behaving in strange ways. Fast radio bursts—or FRBs—are very rare, very quick blasts of radio waves originating billions of light years away, Popular Science explains.
研究人員剛剛宣布發(fā)現(xiàn)來自外太空的古怪無線電訊號。《大眾科學(xué)》雜志解釋道，高速射電爆發(fā)(FRB)是非常少見的，這是一種數(shù)十億光年外聚集的高速無線電波。
It’s unclear where exactly in the universe they’re coming from and what’s causing them. Since the first one was discovered in 2007, scientists have found only 17 total, and none of them ever repeat, the Verge reports. At least that’s what everyone thought. According to a paper published this week in Nature, researchers at Cornell University have found evidence of FRBs that do just that.
目前尚不清楚它們的成因以及確切的來源地。前沿網(wǎng)說，自從科學(xué)家們在2007年第一次發(fā)現(xiàn)該現(xiàn)象開始，至今只發(fā)現(xiàn)了17次相同的現(xiàn)象，然而它們之中沒有重復(fù)的片段。至少這是所有人的看法。根據(jù)本周在《自然》上出版的一篇論文，康奈爾大學(xué)的研究人員已經(jīng)找到了表明FRB傳輸?shù)淖C據(jù)。
Scientists used to think FRBs were caused by "cataclysmic events," such as neutron stars colliding with each other and exploding. Repeating FRBs means that can’t be the case. "This research shows for the first time that there can be multiple FRBs from the same place in the sky," researcher Shami Chatterjee says in a press release. "Whatever produces the FRB can’t be destroyed by the burst, because otherwise, what would produce the next pulse?"
科學(xué)家們一度認(rèn)為是一些譬如中子星相撞或爆炸的“災(zāi)難性事件”引發(fā)了FRB現(xiàn)象。然而重復(fù)的FRB現(xiàn)象卻打破了這種猜想。研究人員Shami Chatterjee在通訊稿中說：“這次研究首次表明了會有多重來自天空同一個角落的FRB現(xiàn)象。不管是什么，只要是FRB的生成源就不可能被爆炸毀壞，否則誰來制造下一波FRB?”
And the mystery deepens: "We’re showing that whatever battery drives FRBs, it can recharge in minutes," astronomy professor James Cordes says. "The energy of the event becomes very problematic." Researchers hope to next pinpoint where the FRBs are coming from in order to figure out what they’re coming from, and they’ll be helped by three massive radio telescopes that start operating next year.
而疑團(tuán)卻顯得更重了，天文學(xué)教授James Cordes說：“我們展示了不管是怎樣的電池驅(qū)動著FRB，它能在短短幾分鐘之內(nèi)供給能量。而這個現(xiàn)象所呈現(xiàn)的能量讓人心生疑慮。”研究人員希望能夠精確定位FRB的來源地，從而弄清它們的來源是什么。他們將使用三臺將于明年投入使用的大型無線電望遠(yuǎn)鏡。
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