首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Officials at the White House announced a new space policy focused on managing the increasing number of satellites that companies
Officials at the White House announced a new space policy focused on managing the increasing number of satellites that companies
admin
2021-01-08
29
问题
Officials at the White House announced a new space policy focused on managing the increasing number of satellites that companies and governments are launching into space. Space Policy Directive-3 lays out general guidelines for the United States to mitigate (缓解) the effects of space debris and track and manage traffic in space.
This policy sets the stage for the Department of Commerce to take over the management of traffic in space. The department will make sure that newly launched satellites don’t use radio frequencies that would interfere with existing satellites, and schedule when such new satellites can be launched. This only applies to American space activities, but the hope is that it will help standardize a set of norms in the dawning commercial spaceflight industry throughout the world.
Space, especially the space directly around our planet, is getting more crowded as more governments and companies launch satellites. One impetus for the policy is that companies are already starting to build massive constellations (星座), comprising hundreds or thousands of satellites with many moving parts among them. With so much stuff in space, and a limited area around our planet, the government wants to reduce the chances of a collision. Two or more satellites slamming into each other could create many more out-of-control bits that would pose even more hazards to the growing collection of satellites in space.
And it’s not like this hasn’t happened before. In 2009 an old Russian craft slammed into a communications satellite, creating a cloud of hundreds of pieces of debris and putting other hardware at risk. Journalist Sarah Scoles reports that NASA currently tracks about 24,000 objects in space, and in 2016 the Air Force had to issue 3,995,874 warnings to satellite owners alerting them to a potential nearby threat from another satellite or bit of debris.
That’s why this new policy also includes directions to update the current U. S. Government Orbital Debris Mitigation Standard Practices, which already require any entity that launches a satellite or spacecraft io vigorously analyze the likelihood that any of their actions, from an unexpected failure or normal operations, will create more space debris. It includes accounting for any piece of debris they plan to release over 5mm that might stay in orbit for 25 years or more. It might seem surprising to think about an item staying in space for that long, but the oldest satellite still in orbit—Vanguard 1—turned 60 in 2018.
Agencies and companies throughout the world are working on developing technology that would dispose of or capture space debris before it causes serious damage. But for now, the U.S. government is more focused on preventing new debris from forming than taking the trash out of orbit.
What is the purpose of the new U. S. space policy?
选项
A、To lay out general guidelines for space exploration.
B、To encourage companies to join in space programs.
C、To make the best use of satellites in space.
D、To improve traffic conditions in space.
答案
D
解析
推理判断题 。定位句指出,美国新的太空政策,即“太空政策3号指令”,为美国缓解太空碎片的影响以及跟踪和管理太空交通清楚地解释了一般指导原则。第二段第一句也提到,这一政策为美国商务部接手太空交通管理奠定了基础,故答案为D)。
转载请注明原文地址:https://jikaoti.com/ti/TuBFFFFM
0
大学英语六级
相关试题推荐
ABestFriend?YouMustBeKiddingA)Fromthetimetheymetinkindergartenuntiltheywere15,RobinShreevesandherfrien
近年来中国经济增长很快,而污染和排放(emissions)问题也同样惊人。中国已是全球最大的二氧化碳(carbondioxide)排放国,尽管其经济规模仅为美国的一半左右。最大污染源是煤炭。中国煤炭消耗量约占全球的五分之二,并以每年约10%的速度增长。好
A、Itdeterminesifyoucouldearnalot.B、Itismoreimportantthanpractice.C、Itisnotmuchrelatedtoyourpracticalwork.
A、Theopportunitiestoknowmorepeople.B、Thefriendswhohavethesamevalue.C、Theplaceswherewefeelcomfortable.D、Theth
Reebokexecutivesdonotliketoheartheirstylishathleticshoescalled"footwearforyuppies(雅皮士,少壮高薪职业人士)".Theycontendtha
ConradHiltonreallywantedtobeabanker.Instead,hesuccessfullychangedthe【C1】______purchaseofaTexaslow-endhotelinto
高速公路(expressway)是一个国家走向现代化的桥梁,也是发展现代交通业的必要条件。近几年,中国高速公路蓬勃发展,截止到2012年,中国高速公路的总里程(totalmileage)已经达到9.6万公里,位居世界第二。国家高速公路网建成后,通车里程
那达慕大会(NadamaFair)是蒙古族(Mongolian)人民具有鲜明民族特色的传统活动。“那达慕”是蒙古语,意为“娱乐、游戏”,还可以表示人们丰收的喜悦之情。每年农历六月初四开始的那达慕大会,是草原上一年一度的盛会。它是为适应蒙古族人民生活需要而
Forthispart,youareallowed30minutestowriteashortessayentitledTheImpactofOnlineGamesonCollegeStudents.Youre
A、Theyprefercooltemperatures.B、Theycansurviveextremeconditions.C、Theyarevulnerabletoradiation.D、Theyhaveaverys
随机试题
下列有关风湿病的叙述,正确的有
女,34岁。月经量进行性减少,现闭经半年,泌乳3个月,首选检查项目应是
下面有关工程建设各参与方的质量责任的叙述正确的是:()。
如果该施工单位营业执照允许经营范围无销售石材业务,则设买卖合同为( )合同。该定金合同的生效日期为( )。
重锤表面夯实的加固深度一般为()。
下列不是封闭式基金上市交易的条件的是()。
2010年巴塞尔协议Ⅲ的主要内容有()。
假设资本资产定价模型成立,表中的数字是相互关联的。求出表中“?”位置的数字(请将结果填写在给定的表格中,并列出计算过程)。
与矩阵A=可交换的矩阵为________。
TheWhiteHousewasbuiltinWashington______.Theoriginalhomeofthepresidentneededtoberebuilt______.
最新回复
(
0
)