Which characteristic in extrasolar planets is one for which we look as a likely characteristic of a life-bearing planet?
A) large size (Jupiter-sized)
B) an oxygen-rich atmosphere
C) an orbit around a star much more massive than the Sun
D) a highly eccentric planetary orbit

Question

Quizplus · Accepted Answer

An oxygen-rich atmosphere may suggest the presence of life, as photosynthesis by organisms can produce atmospheric oxygen. Large size, orbit around a massive star, and highly eccentric orbits are not necessarily indicative of life-bearing planets.

Which Characteristic in Extrasolar Planets Is One for Which We