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question 4 a. Define the concept of a star's habitable zone and giving appropriate examples list some of the complexities associated with this concept. Also explain why conditions might be suitable

for life outside of such a zone. b. What effect might the mass of a star have on the viability of its continuous habitable zone? c. Briefly discuss the role of obliquity oscillations on Mars in controlling the Martian climate and why such oscillations could be significant for the survival of life on Mars.

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