All of the following characteristics are usually taken to be sufficient to rule out the existence of life on an extrasolar planet EXCEPT ONE.Which is the exception?
A) The planet is too close to the star.
B) It is a large, gas planet with no solid surface.
C) The planet has a highly eccentric orbit.
D) The star around which the planet orbits is older than the Sun.

Question

Quizplus · Accepted Answer

While the other characteristics (close distance to the star, lack of solid surface, highly eccentric orbit) are typically associated with conditions that do not support life, the age of the star around which the planet orbits does not necessarily preclude the possibility of life. There are many variables involved in determining whether a planet can support life, and the age of the star is just one factor. Therefore, choice D is the exception.

All of the Following Characteristics Are Usually Taken to Be