Stellar Kinematics - High-velocity Stars

High-velocity Stars

Depending on the definition, a high-velocity star is a star moving faster than 65 km/s to 100 km/s relative to the average motion of the stars in the Sun's neighbourhood. The velocity is also sometimes defined as supersonic relative to the surrounding interstellar medium. The three types of high-velocity stars are: runaway stars, halo stars and hypervelocity stars.

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    They cannot scare me with their empty spaces
    Between stars—on stars where no human race is.
    I have it in me so much nearer home
    To scare myself with my own desert places.
    Robert Frost (1874–1963)