Hot Jupiters were a surprise to astronomers. What is the current explanation for their existence?
A) Jupiters actually can form close to the host star, since they do not require as much hydrogen compounds and ice as originally thought.
B) The temperature of the hot Jupiters is highly uncertain, so they might not be as hot as the astronomers say.
C) Jupiters are supposed to form far away from their host star, and then they migrate closer through gravitational interactions with the protoplanetary disk.
D) Jupiters form as a companion to the host star, but fail to become actual stars themselves because they are not massive enough.
Question 2
The term observable universe refers to ________.
A) the portion of the universe that is not hidden from view by, for example, being below the horizon
B) that portion of the universe that we have so far photographed through telescopes
C) that portion of the universe that we can see in principle, given the current age of the universe
D) the portion of the universe that can be seen by the naked eye
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