- UID
- 379449
- 在线时间
- 小时
- 注册时间
- 2008-9-16
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
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1'01
The author describes the phenomenon that planets stop inward to their stars.
1'41
The explanation for the status, halting inward for the planets to the stars, is that the tidals and grativity force combination to halt the inward trend
2'37
The explanations for the hot J halting inward are as following: first, magneitic field from the stars;second, dust outside the planets; third, tidal force for the stars to halt the circulatizing orbit
1'36
The gas outside the stars impact the inward of the planets, this explanation accroding with the explanation of tidal force
2'23
The author explains the phenomenon ejection of nova for T, and after the ejection some materials are outlaied outside of the stars.
2'23
The author introduce the phemomenon of light echo, which enables scientists to, first time, learn the eruption material from the stars, and estimate the distance between the nova eruption and Earth.
3'41
The author explains the reason why the researchers research the sonic boom, just because researchers want to find out an acceptable sonic boom from the aircraft, in order to be comfortable for the public.
And then the author introduce the process for a sonic boom experiment. Before the starting of the experiment and after the experiment, the subjects will be test their listening ability. Also, during the experiment, there is an monitoring system to control the degree of the noise.
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