Assuming an absolutely flat rotation curve, what would be the orbital speed of a star on the outer edge of the disk of the observable galaxy?

Question

Quizplus · Accepted Answer

An absolutely flat rotation curve implies that the orbital speed of stars in the galaxy does not decrease with distance from the galactic center. The typical orbital speed for stars in the disk of galaxies like the Milky Way, which is often used as a reference for such discussions, is around 220 km/s. This value is consistent with observations of stars at various distances from the center of such galaxies.

Assuming an Absolutely Flat Rotation Curve, What Would Be the Orbital