peculiar velocity

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Noun1.peculiar velocity - velocity with respect to the local standard of rest
speed, velocity - distance travelled per unit time
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They used galaxies' peculiar velocities, which are the galaxies' motions due to the local gravitational landscape.
The CLUES simulations use the observed positions and peculiar velocities of galaxies within 10,000,000 light-years of the Milky Way to accurately simulate the local environment of the Milky Way.
The new survey data are also being analyzed to find galaxies' individual peculiar velocities caused by neighboring masses.