SAT Reading and Writing Practice Question #1196 (Hard (800)) | Test Citadel
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SAT Reading and Writing Difficulty: Hard (800)

Digital SAT Reading and Writing Practice Question #1196

Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.

The field of astrobiology, which explores the origin, evolution, and distribution of life in the universe, relies heavily on data from various space missions. Among the most successful is the Kepler Space Telescope, a retired NASA observatory. The telescope's primary mission was to discover exoplanets, particularly those that might be habitable. One of its most celebrated findings involved Kepler-186f the first Earth-size planet found in the habitable zone of another star, a discovery that excited scientists worldwide. Which choice best corrects the punctuation in the underlined portion of the sentence?
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Socratic AI Engine Step-by-Step Derivation
0ms Precomputed
Tactical Insight (Hint 1)

Consider whether the descriptive phrase 'the first Earth-size planet found in the habitable zone of another star' is essential or non-essential information about 'Kepler-186f.' Does the sentence need this phrase to identify which planet is being discussed?

Elimination Framework (Hint 2)

Remember that non-essential phrases, including appositives, are typically set off by commas. If such a phrase appears in the middle of a sentence, it requires a comma both before and after it.

⚡ 15-Second Desmos Speed Hack

⚡ Hack the Test speed shortcut: When you encounter a proper noun (like a specific name of a person, place, or object) followed by a descriptive phrase, immediately suspect a non-essential appositive. Non-essential appositives are almost always set off by commas on both sides if they appear in the middle of a sentence. Look for the option that adds the missing comma(s) to create this 'comma-phrase-comma' structure. Also, be wary of options that introduce unnecessary words like 'that was' or 'which is,' as SAT often favors concise appositive constructions over wordier relative clauses.

Masterclass Solution & Distractor Trap Analysis

The core issue in this sentence is the correct punctuation of an appositive phrase. An appositive is a noun or noun phrase that renames or explains another noun right beside it. In the given sentence, 'Kepler-186f' is a specific proper noun...

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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