ACT Science Practice Question #1528 (Hard (33)) | Test Citadel
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ACT Science Difficulty: Hard (33)

Digital ACT Science Practice Question #1528

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

Two astrophysicists debate galaxy rotation curves: Scientist 1 argues that cold dark matter halos surround galaxies, providing missing gravitational mass to explain flat orbital velocities at large radii. Scientist 2 argues that dark matter particles have never been detected and that Modified Newtonian Dynamics (MOND) correctly modifies gravitational acceleration (a = sqrt(a0 * g_N)) at sub-nanometer accelerations. Which observation would most challenge Scientist 2's MOND hypothesis?
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Directly detecting dark matter destroys the claim that dark matter is fictitious.

Masterclass Solution & Distractor Trap Analysis

Scientist 2 claims dark matter does not exist. Directly detecting dark matter particles would decisively disprove MOND....

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

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