Which of the following is, to the best of our knowledge, in the habitable zone of its star:
A) a "hot Jupiter" taking 4 days to orbit a G-type main sequence star
B) a planet about 1.05 AU from a G-type main sequence star
C) a Jupiter-mass planet taking 15 years to orbit a K-type main sequence star
D) a planet in an orbit the size of the Earth's around a red giant star
E) all of the above

Question

Quizplus · Accepted Answer

The habitable zone refers to the region around a star where conditions are suitable for liquid water to exist on the surface of a planet. Option A describes a "hot Jupiter," which is a gas giant planet that orbits very close to its star and is likely too hot for liquid water. Option C describes a Jupiter-mass planet, which may also be too massive to support life as we know it. Option D describes a planet orbiting a red giant star, which is generally considered unlikely to support life due to the star's stage in its life cycle. Option B is the best choice as it describes a planet at a distance from a G-type main sequence star that is within the habitable zone.

Which of the Following Is, to the Best of Our