[越毒]陆月叁起越毒（共59只，6/28-22:07更新）

hemingsun

机经2.2.5 galaxy cluster的原文（我猜的，应该挺像的，希望狗主人能确认）

GWD27-Q10 to Q12:
      Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own gravity, leaving only a gravitational field so strong that nothing escapes it. Astronomers must infer the existence of black holes, which are invisible, from their gravitational influence on the visible bodies surrounding them. For example, observations indicate that gas clouds in galaxy M87 are whirling unusually fast about the galaxy’s center. Most astronomers believe that the large concentration of mass at the galaxy’s center is a black hole whose gravity is causing the gas to whirl. A few skeptics have argued that the concentration of mass necessary to explain the speed of the whirling gas is not necessarily a black hole: the concentration in M87 might be a cluster of a billion or so dim stars.
    The same hypothesis might have been applied to the galaxy NGC 4258, but the notion of such a cluster’s existing in NGC 4258 was severely undermined when astronomers measured the speed of a ring of dust and gas rotating close to the galaxy’s center. From its speed, they calculated that the core’s density is more than 40 times the density estimated for any other galaxy.  If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.

朵朵0912

感激楼主~！！

luoweijia0511

谢谢楼主，积攒RP了

树林子的天空

楼主，关于玻璃的那篇，我记得是今年2月机经里面考过的，包括题目和思路2月jj那部分都讨论很全~ 内容和这个月的狗主人回忆一致，附上附件，供参考~~ （有雅思原文那篇的word版，方便在电脑上看的时候做标记！）

veritasw

谢谢！！！

玫牡昙

必须赞一下这个月的越毒鸡精原文太足了，我得好好消化。
谢谢整理者，辛苦啦！！！

Karenzz

后天就要考了。。。。加油！！ 谢谢楼主！！！

Karenzz

好多原文哦~~ 太有爱了~~ 要好好消化啊~~

Bale

LZ更新好快~

shirley8995

这个月的阅读太给力了，多谢LZ，加油哈！