Which new process was added to the nebular theory of solar system formation to account for the existence of Jupiter-mass planets that orbit close to their stars (the "hot Jupiters")?
A) Planets can migrate from the orbits in which they are born.
B) In addition to the categories of terrestrial and jovian, there must be an "in-between" category of planet that has the mass of a jovian planet but the composition of a terrestrial planet.
C) In some star systems, it is possible for jovian planets to form in the inner solar system and terrestrial planets to form in the outer solar system.
D) Giant impacts can affect planets after they form.
A) Planets can migrate from the orbits in which they are born.
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FIG 3-23
Jominy end-quench test
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