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外星人來了?加拿大發現15億光年外重複無線電波

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加拿大的一架望遠鏡在兩個月內,捕獲到13個快速射電暴,其中有一個很不同尋常的重複電波,這個電波來自15億光年外。科學家表示,不能排除這一電波是來自外星宇宙飛船的可能性。

Astronomers have revealed details of mysterious signals emanating from a distant galaxy, picked up by a telescope in Canada.

加拿大的一架望遠鏡捕獲到來自遙遠星系的神祕信號,近日天文學家揭祕了這些信號的細節。

emanate ['eməneɪt]:.發出,散發

外星人來了?加拿大發現15億光年外重複無線電波

The precise nature and origin of the blasts of radio waves is unknown.

這些快速射電暴的性質和來源尚不得而知。

Among the 13 fast radio bursts, known as FRBs, was a very unusual repeating signal, coming from the same source about 1.5 billion light years away.

在這13個快速射電暴(FRB)中,有一個電波很不同尋常,它來自15億光年外,並且是重複電波。

light year:光年

[小知識:什麼是“快速射電暴”?]

宇宙中有一種快速發生,輻射能量極高又迅速消失的神祕現象,叫做“快速射電暴”(FRBs),這種爆發持續時間極短,通常只有幾毫秒,是一種物理起源尚不明確的河外射電束,卻能夠釋放出相當於太陽在一整天內釋放的能量,以至於可以在數十億光年之外的距離被觀察到,但它們具體的產生機制究竟是什麼,仍然存在爭論。甚至有人認爲這是外星人發出的信號。

Such an event has only been reported once before, by a different telescope.

此前研究者用不同的望遠鏡也捕捉到過同樣的電波。

"Knowing that there is another suggests that there could be more out there," said Ingrid Stairs, an astrophysicist from the University of British Columbia (UBC).

“第二次捕捉到重複電波,意味着我們還可能捕捉到更多,”不列顛哥倫比亞大學的天體物理學家英格麗·斯泰爾斯稱。

astrophysicist:[,æstrəʊ'fiːzɪsɪst]:n.天體物理學家

"And with more repeaters and more sources available for study, we may be able to understand these cosmic puzzles - where they're from and what causes them."

“有了更多重複電波和更多可供研究的資源,我們也許能夠解開這些宇宙的謎題:這些電波是從何而來,又是什麼原因造成的。”

The CHIME observatory, located in British Columbia's Okanagan Valley, consists of four 100-metre-long, semi-cylindrical antennas, which scan the entire northern sky each day.

捕捉到這一電波的是加拿大氫強度測繪實驗射電望遠鏡。它位於不列顛哥倫比亞省奧卡諾根山谷,由4個100米長的半圓柱天線組成,每天都會對整個北部天空進行掃描。

The telescope only got up and running last year, detecting 13 of the radio bursts almost immediately, including the repeater.

這臺望遠鏡於去年啓用,並在啓用後不久就檢測到13次射電爆,包括這個重複電波。

The research has now been published in the journal Nature.

這一研究發表在《自然》雜誌上。

"We have discovered a second repeater and its properties are very similar to the first repeater," said Shriharsh Tendulkar of McGill University, Canada.

加拿大麥基爾大學的斯里哈什·滕杜卡爾說:“我們發現了重複的電波,它的屬性與上一次發現的電波非常相似。”

"This tells us more about the properties of repeaters as a population."

“這使我們獲得了更多關於這些電波整體特性的信息。”

There are a number of theories about what could be causing them.

目前存在多種理論解釋這些宇宙電波的來源。

They include a neutron star with a very strong magnetic field that is spinning very rapidly, two neutron stars merging together, and, among a minority of observers, some form of alien spaceship.

例如,這些電波可能來自一顆具有強磁場的快速旋轉的中子星,可能是兩顆中子星合併在了一起等。此外,有少數觀察者認爲,這些電波其實是來自某種外星宇宙飛船。