do galaxies spin like a solid, if so why do they look like a vortex of liquid with the inside spinning faster
and it's extra mass where is the reason for anomalous velocity wouldn't eat star have an anomalous velocity and there for average velocities all around would work the same or are people thinking that dark matter is concentrated in the outer galaxy
and it's extra mass where is the reason for anomalous velocity wouldn't eat star have an anomalous velocity and there for average velocities all around would work the same or are people thinking that dark matter is concentrated in the outer galaxy
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What is with the "umm"s? I know people speak that way sometimes but when you type you actually have time to think ahead about what you are trying to communicate.
But the galaxy is more gas than solid or liquid. Dark matter is what keeps the spiral arms from wrapping ever tighter as the galaxy spins, since Kepler's law states that objects moving closer to the center of mass revolve more rapidly than further out. The galaxy doesn't follow that rule (except near the very core where the super-massive black hole lurks), the outer arms and inner arms move at the same rate around the center of the galaxy.
Dark matter is what keeps the spiral arms moving as a unit, even though individual stars will drift relative to each other. If we only count the visible parts of a galaxy then there simply isn't enough matter for galaxies to rotate in the way that they do. Dark matter suggest more mass in the spiral arms (and maybe halo) to allow what we see to be correct. It exerts some kind of gravity, yet we don't seem to be able to interact with it, let alone see it, like some kind of ghost.
But the galaxy is more gas than solid or liquid. Dark matter is what keeps the spiral arms from wrapping ever tighter as the galaxy spins, since Kepler's law states that objects moving closer to the center of mass revolve more rapidly than further out. The galaxy doesn't follow that rule (except near the very core where the super-massive black hole lurks), the outer arms and inner arms move at the same rate around the center of the galaxy.
Dark matter is what keeps the spiral arms moving as a unit, even though individual stars will drift relative to each other. If we only count the visible parts of a galaxy then there simply isn't enough matter for galaxies to rotate in the way that they do. Dark matter suggest more mass in the spiral arms (and maybe halo) to allow what we see to be correct. It exerts some kind of gravity, yet we don't seem to be able to interact with it, let alone see it, like some kind of ghost.
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Weird, I though for sure this question had been deleted.
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Galaxies do not spin like a solid objects. Stars in the outer portions of galaxies move too fast for the visible mass of the galaxy to be the cause