UPSC Prelims 2015 -Question 45

45. The term ‘Goldilocks Zone’ is often seen in the news in the context of

1. a) the limits of habitable zone above the surface of the Earth
2. b) region inside the Earth where shale gas is available
3. c) search for the Earth-like planets in outer space
4. d) search for meteorites containing precious metals

The correct answer is Option 3. 

• Goldilocks Zone  
• The circumstellar habitable zone (CHZ), also known as the habitable zone (Goldilocks Zone), is the area surrounding a star in astronomy and astrobiology. Hence, Option 3 is correct. 
• Planetary-mass objects can sustain liquid water on their surfaces in this region if the atmospheric pressure is high enough. 
• The ‘Goldilocks Zone,’ also known as the habitable zone, is the area within which the temperature is just ideal for water to remain liquid. 
• Researchers are discovering unexpected sites where life might flourish. 
• NASA announced the discovery of an Earth-sized planet called TOI 700 d in the “habitable zone” of its star in January 2020. (Goldilocks Zone). 
• Also more likely to be in the Goldilocks zone are planets with a terrestrial atmosphere. 

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