科学家发现一颗遥远的不灭恒星 分享到
Distant Star Refuses to Die 2017-11-21103212

中英
Việt-Anh
ไทย-อังกฤษ
英文

双击原文单词查看解释

原文跟读

Scientists have long believed that a star explodes when it reaches the end of its life.
长期以来,科学家一直认为,恒星在生命终结之际会自爆。
This explosion is called a supernova.NASA, the American space agency, describes a supernova as the largest explosion that takes place in space.
这种现象的学名是超新星爆炸。美国宇航局(NASA)称,超新星爆炸是宇宙最大规模的爆炸。
Recently, a team of astronomers discovered evidence of one star that apparently refuses to die.
最近,一组宇航员发现证据表明,有一颗恒星的生命始终没有终结过。
The long life of this supernova is raising questions for experts who thought they knew how dying stars worked.
这颗长寿的超新星让专家们产生了疑惑,因为他们一直以为自己对垂暮的恒星生命周期如何运作了如指掌。
The star, officially called iPTF14hls, is 500 million light-years away from Earth.One light-year equals 9.5 trillion kilometers.
这颗恒星的官方名字是iPTF14hls,距离地球有5亿光年。一光年是9.5万亿公里。
It was found in 2014 and appeared to be a normal supernova, growing less bright over time.
2014年,有人发现了这颗看似正常的恒星,随着时间的推移,亮度逐渐减弱。
But a few months later, astronomers at the Las Cumbres Observatory saw it getting brighter.In fact, they have seen the light grow brighter, then weaker, then stronger again five different times.They also found evidence of an explosion in the same area 60 years ago.
但几个月后,拉斯昆布瑞天文台的天文学家发现它的亮度逐渐增强。实际情况是,他们观测到这颗恒星的亮度先是变强,随后变弱,然后再变强,如此反复五次。他们还发现有迹象表明,60年前,这片区域发生过一次爆炸。
The findings were reported in the journal Nature.
他们的发现成果发布在了《自然》期刊上。
The observatory is based in the American state of California.The astronomers say they continue to keep watch of the star with robotic telescopes around the world.
这家天文台位于美国加州。天文学家表示,他们表示会继续用全球的程控望远镜来观测这颗恒星。
Supernovas normally grow dark after about 100 days.But this one is still going strong after 1,000 days, although it is slowly getting darker.
通常情况下,超新星会在大概100天后逐渐变暗。但这颗超新星过了1000天,依然十分明亮,虽然也亮度也在逐渐减弱。
It’s very surprising and very exciting, said Iair Arcavi, who is with the Physics Department at the University of California, Santa Barbara.
艾埃尔·阿卡威表示,这很让人惊奇,也很令人激动。阿卡威是圣巴巴拉市加利福尼亚大学物理系的工作人员。
Arcavi led the team of astronomers.He said “We thought we’ve seen everything there is to see in supernova after seeing so many of them,but you always get surprised by the universe.This one just really blew away everything we thought we understood about them.”
阿卡威是这组天文学家的领头人。他表示,“过去我们以为,我们已经观测过这么多颗超新星了,对它们的一切都很熟悉了,但宇宙就是总带给你惊喜。这颗恒星将过去我们所认为自己了解的东西都打破了。”
This supernova is believed to have once been a star up to 100 times larger than our sun.It is possibly the biggest explosion of a star ever observed.The Associated Press says this might explain its unusual ability to survive.
我们认为,这颗超新星的体型是地球的100倍,是我们观测过的恒星中爆炸规模最大的一个。据美联社报道,这或许也就能就解释它非凡的生存能力了。
One theory is that the supernova is actually several explosions happening so quickly that they run into one another.It could also be a single explosion that repeatedly gets brighter and darker.
有一种理论说,这颗超新星其实是多起爆炸同时快速发生的结果。也可能是一次单独的爆炸产生时而愈发明亮时而愈发昏暗的现象。
Another idea is that this star was so large, and its core or middle so hot, that an explosion only blew away the star’s outer layers.This would mean the star’s core was left solid enough to repeat the entire process.However, this theory still does not explain everything about this supernova, Arcavi said.
还有人认为,这颗恒星体型太过庞大,其内核或者说中间部分温度太高,所以即便是爆炸,也只使其脱掉了外层部分。也就是说,这颗恒星的内核十分坚固,经得住整个过程的回环往复。不过,这种理论并不能解释关于这颗超新星的一切疑惑,阿卡威如是说道。
Avi Loeb is chairman of the Astronomy Department at Harvard University in Massachusetts.Loeb was not involved in the study.But he thinks the star’s core might be either a black hole or a magnetar.A magnetar is a neutron star with a strong magnetic field.However, there will need to be further study in order to better explain what is happening, Loeb said.
阿维·罗卜是马萨诸塞州哈佛大学天文学系的主任。罗卜并未参加这次研究,但他认为,这颗恒星的内核可能要么是一个黑洞,要么是一颗磁星。磁星是一种中子星,有很强的磁场。不过,要更好地解释发生了什么,还需要进一步的研究,罗卜如是说道。
Scientists also do not know if this unusual supernova is one of a kind.For now, it appears to be rare since no others have been identified.
很多科学家也不知道这颗异常的超新星是否真的是超新星的一种。目前为止,这颗超新星只是看起来异常,但并没有其他罕见现象出现。
“We could actually have missed plenty of them because it kind of masquerades as a normal supernova if you only look at it once,” Arcavi said.
“实际上,我们可能已经错过了很多这样的超新星,因为如果只看一次的话,它们的伪装会让我们认为它们是正常的超新星,”阿卡威如是说道。
However one thing that everyone agrees on is that nothing lasts forever, not even this super supernova.
不过,有一件事是大家都认同的,那就是,没有什么可以永垂不朽,即使这颗超新星也不例外。
“Eventually, this star will go out at some point,” Arcavi said. “I mean, energy has to run out eventually.”
“这颗恒星总有一天会消失的,”阿卡威如是说道。“因为总有一天它会耗尽能量的。”
I’m Phil Dierking.
菲尔·迪尔金为您播报。

点击加载更多

我的生词本