GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - 1417U1415VE5PXMCJ

It can be inferred from the passage that the "attempts" share which of the following goals? A. to explain how a Jupiter-sized planet could form so close to its parent star. B. to explain what prevents a hot Jupiter from colliding with its parent star. C. to determine whether a hot Jupiter is formed from a protoplanetary disk of dust and gas. D. to determine whether a hot Jupiter's gravitational field is strong enough to create a groove in its protoplanetary disk E. to account for hot Jupiters in a way that is not inconsistent with the standard theory of planetary formation.