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[–] Commie_Meta ago 

The stars' speed can be measured using the Doppler shift of their color spectra.

The European Space Agency's Gaia observatory will soon have complete speed observations of 1% of our galaxy's stars. It will be able to directly see the orbital effects of dark matter if there are any.

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[–] B3bomber ago 

Don't forget to find your own base movement speed during this time along with the are you moving away or towards.