题目内容

收藏纠错

题目材料：

Astronomers have had difficulty accounting for certain planets discovered outside our solar system. They are called hot Jupiters because each is similar in mass to Jupiter, the largest solar-system planet, but orbits its parent star at a fraction of the distance at which Earth, let alone Jupiter, orbits the Sun. In the standard, solar-system-based theory of planetary formation, such as a massive planet could not form so close to a star. So most attempts to explain a hot Jupiter`s existence envision it forming farther away, then migrating inward. According to one hypothesis, the planet`s gravitational field tugs on the protoplanetary disk of dust and gas from which it formed. The disk exerts its own gravitational tug, and this interplay of forces robs the planet of momentum in its orbital path, forcing it to spiral in toward the star. According to another hypothesis, the planet`s gravitational field is so strong that it creates a groove in the disk, partitioning it into inner and outer regions; the resulting gravitational interactions between the planet and these regions cause the planet to lose orbital momentum and spiral inward. Another question remains: what prevents the planet from continuing its spiral until it collides with the star?

The author of the passage mentions "Earth" primarily in order to

Astress the massive size of a hot Jupiter
Bemphasize the proximity of a hot Jupiter to its parent star
Cimply that hot Jupiters are unlikely to harbor extraterrestrial life
Dpoint out differences between Earth and Jupiter with regard to their orbital distance from the Sun
Eillustrate how hot Jupiters might fit into the standard theory of planetary formation

B显示答案

登录后才可以添加做题笔记哦，还没有账号？马上注册

以上解析由考满分老师提供。

题目讨论

已经输入 0 个字标记为提问，会有更多小伙伴帮你解答提交

全部讨论

只看提问

按时间排序

按点赞数排序

拓展练习

练习记录

最新提问

题目内容

题目讨论