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There is 288.218 stars per cubic light-year in the milky way bulge.

At the density, spacetime for the entire 40 parsec radius should be severely distorted.

The total stellar mass of the bulge is about 25 billion Solar masses.

The Milky Way has an approximate radius of 50 000 light years

F = (6.67 x 10^-11)(25 x 10^9)(1,989E30) (1,989E30) / [ (50,000)(9.4605284 × 10^15) ]^2

F = (6.5968 X 10^60) / (2.2375 x 10^41)

F = 2.94829 x 10^19 Newtons

Let's calculate the gravitational attraction between Ceres (dwarf planet) and Sun

F = 6.67 x 10^-11)(1,989E30)(8,958 x 10^20) / (414 x 10^9)^2

F = (1.884 x 10^41) / 1.7139 x 10^23)

F = 1.099 x 10 ^ 18 Newtons

We can see that the gravitational force exerted by the distorted space the bulge of the milky way provides sufficient force hold onto solar mass objects at the edge of the milky way disk.

I ask again, why is Dark Matter needed?

The closer you are to the Sun, the greater the depression in spacetime.

But if you have a 40 parsec radius spacetime depression relative to disk and arms...

A depression in spacetime is a depression in spacetime period.

There is no need for dark matter.

Imagine two people pulling a blanket, and a third person putting a small bowling ball in the middle.

How can you say, the bulge or bowling ball does not curve the spacetime around it? It does.

The blanket is the milky way, and the bowling ball is the bulge.