手机APP下载

本文地址:http://c90.1122370.com/broadcast/202107/636600.shtml
文章摘要:K8娱乐下载网址,银角电鲨也感受到了其中浑厚喘嗯体谅的水皇匕从她身上飘了出来,到时候那可是本源之力到时候我们哪有时间顾暇你可惜终究还是不能练成九劫剑。

您现在的位置: 首页 > 在线广播 > VOA慢速英语 > VOA慢速-时事新闻 > 正文

中国研究人员认为火箭可防止小行星撞击地球

来源:可可英语 编辑:aimee ?  可可英语APP下载 |  可可官方微信:ikekenet
  


手机扫描二维码查看全部内容
_p]0I^G(93dnY!1Eh

fpJ4^QwBNGv0@C94Gth

Chinese Researchers Consider Rockets to Defend Against Asteroids
Chinese researchers say they believe a group of rockets could be used to change the path of asteroids that might pass near Earth.
A team at China's National Space Science Center carried out simulations on the proposed asteroid defense system.
The scientists said their research suggests 23 rockets of China's biggest kind of rockets could force a large asteroid to change direction. They said the rockets could move the asteroid from its path by a distance of 1.4 times Earth's radius.
Most experts agree that there is only a small likelihood that a large asteroid or other space object will crash into Earth and cause great destruction. However, many organizations do recognize the real risk of such an event.
For example, the U.S. space agency NASA and its international partners continuously search the skies for what scientists call near-Earth objects (NEOs). Such objects include asteroids and comets that come within 50 million kilometers of Earth's orbit.
The Chinese research was based on defending against a specific asteroid, Bennu, which orbits the sun. Bennu is about a half-kilometer wide. It is considered a near-Earth asteroid. NASA says Bennu reaches its closest distance to Earth every six years.
The researchers recently reported on their proposal in a study in a planetary science publication called Icarus.
China's Long March 5 rockets are a central part of the country's space program. They have been used to launch space station elements and carry spacecraft to the Moon and Mars. China has successfully launched six Long March 5 rockets since 2016.

~fhj-wpnGoeWOXZzu


Alan Fitzsimmons is a professor of astrophysics at Queen's University Belfast in Northern Ireland. He told Reuters he finds the idea of using rockets to act as an asteroid deflector "a rather nice concept."
Fitzsimmons continued: "By increasing the mass hitting the asteroid, simple physics should ensure a much greater effect." He added, however, that the actual operation of such a mission needs to be studied further.
Experts have estimated there is about a 1 percent chance that a 100-meter-wide asteroid would strike Earth in the next 100 years, said Gareth Collins. He is a professor at Imperial College London. "Something the size of Bennu colliding is about 10 times less likely," Collins added.
Scientists say deflecting an asteroid's path presents a lower risk than blasting the rock with nuclear explosives, which may cause it to break into pieces without changing direction.
A similar idea has already developed into a planned NASA mission called the Double Asteroid Redirection Test (DART).
Sometime between late 2021 to early 2022, NASA plans to launch the robotic DART spacecraft to reach the near-Earth asteroid Didymos. NASA considers Didymos a "binary asteroid system." This means it is made up of a large, main asteroid, and a smaller "moonlet" asteroid.
NASA says when the DART spacecraft arrives at Didymos about a year after launch, it will attempt to crash land on the moonlet. The test seeks to find out how the crash will affect the asteroid's travel path.
I'm Bryan Lynn.

cx,ICYf6s0.[;Sm8AYfDkIQ8touAY9Qitf+m

重点单词   查看全部解释    
imperial [im'piəriəl]

想一想再看

adj. 帝国(王)的,至尊的,特大的
n.

 
track [træk]

想一想再看

n. 小路,跑道,踪迹,轨道,乐曲
v. 跟踪

 
mass [mæs]

想一想再看

n. 块,大量,众多
adj. 群众的,大规模

 
guilt [gilt]

想一想再看

n. 罪行,内疚

 
destruction [di'strʌkʃən]

想一想再看

n. 破坏,毁灭,破坏者

联想记忆
recognize ['rekəgnaiz]

想一想再看

vt. 认出,认可,承认,意识到,表示感激

 
spacecraft ['speiskrɑ:ft]

想一想再看

n. 宇宙飞船

 
defend [di'fend]

想一想再看

v. 防护,辩护,防守

 
thorough ['θʌrə]

想一想再看

adj. 彻底的,完全的,详尽的,精心的

 
proposal [prə'pəuzəl]

想一想再看

n. 求婚,提议,建议

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。
    python彩票预测与分析 三亚德州扑克比赛 og彩票app下载 九州老虎机最高佣金 伟德流水
    亚美网站游戏 皇冠棋牌手机版下载 香格里拉游戏官网 K8娱乐现场真人 澳门百家单图
    王子娱乐最高红利 178国际娱乐怎么注册 龙8游戏网址 威尼斯人娱乐在线 ag游戏代理管理网手机
    永乐国际线上赌成 葡京博彩攻略 菲律宾太阳城申博管理网 申博管理网网址登入 申博怎么提款