Over what enormous scale have observations confirmed the flatness of the rotation curve persists?

Answer

Out to distances exceeding one million light-years from the nucleus.

A key piece of evidence supporting the inferred mass distribution is the sheer persistence of the flat rotation curve across immense spatial dimensions. This phenomenon is not confined to the immediate vicinity of the bright, central parts of the galaxy. Observations have successfully traced material far into the galactic outskirts, confirming that the high, constant orbital velocities continue steadily even across distances that dwarf the spatial extent of the luminous stellar disk. Specifically, this trend has been verified when tracing matter out past one million light-years from the galaxy’s center, demonstrating the extreme reach of the gravitational structure responsible for maintaining the speed.

Over what enormous scale have observations confirmed the flatness of the rotation curve persists?

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