手机APP下载

您现在的位置: 首页 > 在线广播 > 科学美国人 > 科学美国人太空系列 > 正文

科学美国人60秒:如何检测引力波

来源:可可英语 编辑:aimee   可可英语APP下载 |  可可官方微信:ikekenet
 下载MP3到电脑  批量下载MP3和LRC到手机
加载中..
nDE&YHpftA-kgn;uq7st

V!(Cy^Eqys

This is Scientific American — 60-Second Science. I'm Steve Mirsky.
Got a minute?
In 2016 the Laser Interferometer Gravitational-Wave Observatory, LIGO, made the first accepted detection of gravitational waves.
"So any time you move a mass it produces a gravitational wave...so black holes, like the ones LIGO detected, these are stellar mass black holes, about 10 times the mass of the sun. When they're in orbit they're accelerating constantly, so constantly producing gravitational waves."
Sarah Burke Spolaor, of the National Radio Astronomy Observatory in New Mexico, at the annual meeting of the American Association for the Advancement of Science in Boston on February 18th.
For gravitational waves produced by the acceleration of even bigger masses, we're going to need what's called the Laser Interferometer Space Antenna, or LISA.
"Now if you think of much bigger masses, something like a million times the mass of the sun, these things are moving much more slowly, much more far apart, and they're producing lower frequency gravitational waves. And this is what LISA can detect. So LIGO, which is operating at these very fast orbits, fast frequencies, is unable to detect these things that are moving much more slowly and are on a much bigger scale."
And for even bigger masses, you get to what Burke Spolaor is working on: Pulsar Timing Arrays.

NiinB*w^fj9N#I

引力波.jpg

O-O(v7x;%N7CBPowk

"What we do with this technique is use radio telescopes to observe pulsars, which are neutron stars that are rotating very rapidly and sending their beams of emission across Earth, several hundred times per second...and the idea is of course if a gravitational wave is passing through Earth, the gravitational wave is stretching and squeezing our space time. And the tick that we see from these very, very regularly spinning pulsars is speeding up and slowing down."
"Just like we can scale the stellar mass black holes that LIGO can detect, to very, very intermediate mass very large black holes that LISA can detect, Pulsar Timing Arrays will probe the very massive end of this distribution and the most massive, so the billion to even 10 billion solar mass binary black holes in the universe. So every time you get a galaxy merger you can get a binary supermassive black hole, which then will contribute signal to our Pulsar Timing Arrays by propagating through the galaxy."
"Of course, gravitational waves does not stop at detection. What we really want to do is astrophysics with gravitational waves. And use it as a new tool to observe the universe and understand our place in it."
Thanks for listening for Scientific American — 60-Second Science Science. I'm Steve Mirsky.

FCI6~3qf!LJU+y

_U))EAMjd,S!#RW32

J1uom1FAmLZd,0G!uFM@P+;pDWn^9x1U*y2H@6jPx!rZWj~

重点单词   查看全部解释    
observatory [əb'zə:və.tri]

想一想再看

n. 天文台,气象台,了望台

联想记忆
astronomy [əst'rɔnəmi]

想一想再看

n. 天文学

联想记忆
association [ə.səusi'eiʃən]

想一想再看

n. 联合,结合,交往,协会,社团,联想

联想记忆
gravitational ['grævə'teiʃənəl]

想一想再看

adj. 重力的,引力作用的

联想记忆
frequency ['fri:kwənsi]

想一想再看

n. 频繁,频率

 
laser ['leizə]

想一想再看

n. 激光,镭射

 
technique [tek'ni:k]

想一想再看

n. 技术,技巧,技能

 
mass [mæs]

想一想再看

n. 块,大量,众多
adj. 群众的,大规模

 
observe [əb'zə:v]

想一想再看

v. 观察,遵守,注意到
v. 评论,庆

联想记忆
distribution [.distri'bju:ʃən]

想一想再看

n. 分发,分配,散布,分布

联想记忆

发布评论我来说2句

    最新文章

    可可英语官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的英语学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。