As for the other question, there is no reason to suppose that there is not life in any part of the material cosmic system except earth. No doubt the suns and nebulae cannot harbour material life because there is not the necessary basis, but wherever there is a formed world, Life can exist. It used formerly to be supposed that life could not exist except in conditions identical with the earth, but it is now being discovered that even man and the animals can adapt themselves to atmospheric conditions deficient in oxygen such as exist in the stratosphere—this proves that all depends on adaptation. There are animals that can exist only in the sea, yet sea-animals have become amphibious or turned into land animals—so animals on earth can by habit of the adaptation live only in a certain range of atmosphere and need oxygen, but they could adapt themselves to other conditions—it is a law of habit of Nature, not a law of inevitable necessity of Nature. It is therefore quite possible for life to exist on other planets in our and other systems, though the beings there may not be quite like earthly humanity or life quite the same.
– Sri Aurobindo
Source: CWSA Vol. 28: Letters on Yoga – I: Book I > Problems of Philosophy, Science, Religion and Society > Thought, Philosophy, Science and Yoga > Science and Yoga
