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I assume they should be in the Milky Way galaxy. I have read about it a little but did not find information on where they are.

Which galaxy do the Pleiades belong to?

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With the exception of the Andromeda galaxy and the Magellanic clouds1, every star, star cluster and nebula that is visible to the naked eye is part of the Milky Way. The Pleiades is a star cluster in the Milky Way.

Objects in other galaxies are too far and too dim to be visible with the naked eye.

1The Triangulum galaxy (M33) may also be visible to the naked eye from a dark site to trained observers with excellent vision

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    $\begingroup$ The Triangulum galaxy (M33) is also visible to the naked eye from a dark site. It's believed to be more distant than the Andromeda galaxy, so is probably the most distant object you can see unaided in normal circumstances. (GRB_080319B was briefly naked-eye visible but it's unlikely that anyone actually noticed it.) $\endgroup$ – MichaelB76 May 16 at 8:00
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To give you a perspective the Milky Way Galaxy is between 150,000 and 200,000 light years in across. The Pleiades is less than 450 light years from Earth. In a galactic perspective the Pleiades is incredibly close to us and so clearly within the Milky Way Galaxy.

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    $\begingroup$ The Pleiades are about 1.7% farther from the center of the galaxy than we are. $\endgroup$ – Mike G May 13 at 17:08
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This screen grab from the program Where is M13? shows the location of the Sun and Pleiades in our galaxy.

enter image description here

The Sun is the orange dot, the Pleiades the yellow dot.

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