Which of these characteristics in extrasolar planets is one that astronomers look for as a likely characteristic of a life-bearing planet?

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B) Distance from a Sunlike star of about 1 astronomical unit (au) is a key characteristic astronomers look for in potentially habitable extrasolar planets. This distance places the planet within the habitable zone, where conditions might be right for liquid water to exist on the planet's surface, which is considered crucial for life as we know it.

Which of These Characteristics in Extrasolar Planets Is One That