网站首页 |  官方微博 |  业务合作 |  联系我们
资源共享平台
留学全套委托申请
点此了解详情
留学全程申请指导
点此了解详情
奖学金全套委托申请
点此了解详情
签证全套委托申请
点此了解详情
留学申请专家咨询
点此了解详情
留学申请文书写作
点此了解详情
奖学金数据库  按国家查找奖学金按学历查找奖学金按学科查找奖学金特殊奖学金  留学申请资源库  留学书信模板库奖学金书信模板库个人陈述范文库推荐信范文库简历模板库申请短文范文库套磁信范文库Cover Letter 范文库学习计划范文库  留学申请服务  留学全套申请留学申请指导奖学金全套申请奖学金申请指导访学全套申请访学申请指导签证全套申请签证申请指导留学申请专家咨询留学申请文书写作留学文书写作指导留学面试辅导APS审核辅导留学作品集制作留学作品集辅导
您所在的位置:首页 > 资源共享平台 > 申请短文范文库

申请短文ESSAY范文模板一(天文学)

 

Are We Alone in the Universe?

Throughout its history humankind asked itself this question and constantly tried to answer “no”. The idea of sentient living beings who are not people is present in writings of historians, geographers and other scientists for as long as the science itself exists. Mermaids, cynocephali, various bizarre species of beastmen, antipodes: all of them were embodiments of this dream. In course of time, the limits of the known Universe expanded and it became known that no such creatures existed. The only place to seek for non-human life now is other planets. Is there any hope for finding it?

There are a great number of theories concerning extraterrestrial life. According to the “rare Earth hypothesis”, the conditions on Earth are close to unique and the possibility of them taking place on any other planet is close to zero. However, this theory takes it for granted that the appearance of life requires conditions identical to those on Earth. But is it true? If life on other planets exists, it may be completely different from what we are used to not only in form, but in fundamental principles as well.

Of all the chemical elements only carbon and silicon seem to be suitable for being the basis of life, although silicon can form connections with far less other elements. Needless to say, we have never encountered silicon-based lifeforms, but if they exist, they may have properties that have nothing in common with what we used to associate life with.

完整内容请登陆后查看!点此登陆   免费注册

如有问题,可与我们联系!点此查看联系方式   或在下面留言,我们收到留言后会与您联系!

真实姓名 *
所在城市 *
联系电话 *
电子邮件
其它联系方式
咨询留言
验证码   

资源共享平台

最新申请资源

出国留学服务项目

最新奖学金信息