【阅读】12/03起悦读寂静整理（12/13更新，44原始，38考古）

格斑马的gmat

格斑马的gmat 发表于 2018-12-11 20:41
呼叫逻辑君。。。。

我在胡说八道什么。。我的天

呼叫阅读君。。。。

serenaxu97

阅读版主去哪里了

billyisfragile!

第二段说发现有一些old但是也spin快 然后发现好像有三个原因 first second third balabal

V3:“超新星爆炸”，记得的两道题有：文中第二段提到了1%(one percent)， 是什么目的，回到文中定位，应该是说作者在第二段中讨论的现象是比较独特的，存在于 Golbal Cluster (星团)，在 normal binary system  (双子星)中并不常见。 还有一个问题是问中子星从周围吸收物质后，发生了什么变化。答案应该是选“spin more quickly, and become pulsar again."还有文中的这句话：由于碎物一般寿命很短，所以诞生于碎物种的A同学都是很年轻的。是一个考点.

Astronomers have several reasons to believe this scenario. First, they have observed binary systems in which a normal star, similar to the Sun, dumps material onto a neutron star, causing the neutron star to spin faster and faster. Secondly, many millisecond pulsars have stars orbiting them, whereas only 1 per cent of ordinary pulsars have companion stars. Thirdly, in 1988, astronomers discovered a remarkable millisecond pulsar, PSR 1957+20, in the constellation Sagitta. This pulsar has a companion star that has set the pulsar spinning at high speed, but the companion is now being torn apart by radiation from the pulsar it revived. PSR 1957+20 will end up as a millisecond pulsar with no companion. Indeed, the first millisecond pulsar, PSR 1937+21, is single: its companion must have been completely destroyed.

billyisfragile!

JOURNAL ARTICLE
Black Hole BLOWBACK
** Tucker, Harvey Tananbaum and Andrew Fabian
Scientific American
Vol. 296, No. 3 (MARCH 2007), pp. 42-49
Published by: Scientific American, a division of Nature America, Inc.
https://www.jstor.org/stable/26069189
Page Count: 8

关于galaxy...大概就是说galaxy里面有Hot gas,发出x-ray会产生trillions of new stars

The gas, which is heated primarily by the slow gravitational collapse of the cluster, gives off x-rays. Optical telescopes  cannot see the gas, and x-rays cannot penetrate Earth’s atmosphere, so the discovery and study of this gas has depended on orbiting observatories. Two decades ago astronomers peering  with NASA’s Einstein X-ray Observatory and other instruments noticed that the x-rays carry away so much energy that  the gas should steadily cool off and settle into the center of the  cluster—thus the term “cooling flow.” One of us (Fabian) led  the way in investigating these flows using Einstein and later Germany’s ROSAT x-ray satellite. He and his colleagues calculated the flows would have quite dramatic effects. If they persisted for a billion years, the gas deposited in the central regions of the cluster could form trillions of new stars.

The only trouble was, no one could find them. Observers  looked in vain for large amounts of cool gas and hordes of newly formed stars. If a black hole had swallowed them all, it would  weigh as much as a trillion stars, and not even the biggest black  hole is that massive. Another one of us (Tucker) maintained  that large-scale, long-term cooling flows do not exist. A possible explanation was that long-lasting outbursts of energy  from the central galaxy of the cluster heated the gas enough to  offset the radiative cooling. Radio astronomers had for years  been accumulating evidence for such activity. But it was questionable whether the outbursts provided enough energy distributed over a large enough volume to halt the cooling flows, so  the paradox remained: the hot cluster gas must cool, but the  end product of the cooling mysteriously escaped detection.

zzrsupericeman

谢谢楼主！！！！

ningyeh

謝謝大大分享~

jassicacanidy

月球样本原文>>>
https://science.nasa.gov/science-news/science-at-nasa/2006/28dec_truefake
jj原来的链接失效了

billyisfragile!

jassicacanidy 发表于 2018-12-14 21:26
月球样本原文>>>
https://science.nasa.gov/science-news/science-at-nasa/2006/28dec_truefake
jj原来的链 ...

原文

https://www.newscientist.com/article/mg18625012-000-the-gritty-problem-of-moon-dust/

jassicacanidy

bzy! 发表于 2018-12-15 07:17
原文

https://www.newscientist.com/article/mg18625012-000-the-gritty-problem-of-moon-dust/

谢谢~！