Under what circumstances can differentiation occur in a planet?
A) The planet must have a rocky surface.
B) The planet must be made of both metal and rock.
C) The planet must have an atmosphere.
D) The planet must be geologically active, that is, have volcanoes, planetquakes, and erosion from weather.
E) The planet must have a molten interior.
Question 2
Which of the following is a consequence of the discovery of hot Jupiters for the nebular theory of solar system formation?
A) It has been discarded.
B) It has been modified to allow for the formation of gas giants within the frost line.
C) It has been modified to allow for planets to migrate inwards or outwards due to gravitational interactions.
D) Its status is unclear and awaits further observations that will determine whether hot Jupiters are dense Earth like planets or gas giants.
E) It remains unchanged as it only needs to explain our Solar System.
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