托福阅读之黑洞质疑

  在遥远的外太空有许多神秘的天体,黑洞就是其中之一。至今依然有科学家对于黑洞的存在性持有质疑的观点,但是大部分的天文学家还是相信射电望远镜的观测数据,对黑洞的存在表示认同。从今天起我们将分三次连载这篇关于黑洞的科技文,希望对提高大家的阅读能力有所帮助。

  Astronomers think the object shown in this Chandra X-ray Observatory image (in box) may be an elusive intermediate-mass black hole. Located about 32 million light-years from Earth in the Messier 74 galaxy (M74), this object emits periodic bursts of x-rays at a rate that suggests it is much larger than a stellar-mass black hole but significantly smaller than the supermassive black holes found at the centers of galaxies. Few such middling black holes have been discovered, and scientists aren‘t sure how they form.

  Black holes are the cold remnants of former stars, so dense that no matter—not even light—is able to escape their powerful gravitational pull.

  While most stars end up as white dwarfs or neutron stars, black holes are the last evolutionary stage in the lifetimes of enormous stars that had been at least 10 or 15 times as massive as our own sun.

  When giant stars reach the final stages of their lives they often detonate in cataclysms known as supernovae. Such an explosion scatters most of a star into the void of space but leaves behind a large “cold” remnant on which fusion no longer takes place

免责声明
1、文章部分内容来源于百度等常用搜索引擎,我方非相关内容的原创作者,也不对相关内容享有任何权利 ;部分文章未能与原作者或来源媒体联系若涉及版权问题,请原作者或来源媒体联系我们及时删除;
2、我方重申:所有转载的文章、图片、音频视频文件等资料知识产权归该权利人所有,但因技术能力有限无法查得知识产权来源而无法直接与版权人联系授权事宜,若转载内容可能存在引用不当或版权争议因素,请相关权利方及时通知我们,以便我方迅速删除相关图文内容,避免给双方造成不必要的损失;
3、因文章中文字和图片之间亦无必然联系,仅供读者参考 。未尽事宜请搜索"立思辰留学"关注微信公众号,留言即可。
[托福阅读之黑洞质疑] 文章生成时间为:2015-02-28 06:45:25

立思辰留学专家答疑 - 让专家主动与你联系!

为了节省您的查找时间,请将您要找的信息填写在表格里,留下您的联系方式并提交,我们的顾问会主动与您联系。

意向地区:
您的姓名:
联系电话:
验证码:
联系QQ:
咨询问题:

微信小程序

  • 留学资讯

    留学资讯

  • 大学排名

    大学排名

  • 留学费用

    留学费用

  • GPA查询

    GPA查询

  • 汇率对比

    汇率对比

  • 地图选校

    地图选校

更多

推荐院校