As shown in this lab, the period of an objects revolution decreases as the centripetal force increases. This means that a higher centripetal force leads to a higher rotational velocity. The force supplying the centripetal force on a star is gravity, which is directly proportional to the mass of both objects. This means that because a higher velocity was found, the mass of either the star, or the galaxy, has dark matter, that cannot be measured through luminosity because it is non-luminous, that increases the force of gravitational attraction, and increases the rotational velocity of the
