In planetary science, the discovery of liquid water oceans beneath the icy shells of moons like Europa and Enceladus has reshaped our understanding of habitability. Previously, astrobiologists assumed that life could only exist in a star's circumstellar habitable zone, where surface temperatures allow for liquid water. However, the presence of sub-surface oceans sustained by tidal heating suggests that habitable environments may be far more _______ than once believed, expanding the search for extraterrestrial life beyond traditional orbital boundaries.
Which choice completes the text with the most logical and precise word or phrase?
- prevalentCevap
- Blocalized
- Cprecarious
- Dformidable
Cevap
prevalent
The correct answer is 'prevalent'. The text establishes a contrast between the historical view that life-supporting conditions are restricted to a star's circumstellar habitable zone and the modern understanding that sub-surface oceans on moons like Europa and Enceladus could support life. Because this discovery expands the search beyond traditional boundaries, it suggests that habitable environments are more widespread, or 'prevalent,' than astrobiologists once believed.
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Words in Context: High-Utility Vocabulary