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9th Grade Dark Matter Quizzes , Questions & Answers

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Spinning Mystery: Galaxy Rotation Curves Quiz

Investigate why the outer stars of galaxies move much faster than they should. This Galaxy Rotation Curves Quiz explores the mystery of missing mass. Learn how Vera Rubin's observations of orbital velocities provided the...

Questions: 20 | Attempts: 11 | Last updated: Feb 20, 2026

Sample Question 1
What is the primary anomaly observed in galaxy rotation curves compared to Keplerian predictions?

Stars slow down at the edges

Stars maintain constant speed at the edges

Stars stop moving at the edges

Stars move faster near the center only

Sample Question 2
Visible matter alone is sufficient to explain the gravitational pull required for the observed rotation speeds of galaxies.

True

False

Sample Question 3
In a typical rotation curve graph, what is plotted on the horizontal (x) axis?

Orbital Velocity

Light Intensity

Distance from the center

Mass of the star

9th Grade Dark Matter Quizzes , Questions & Answers

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