C) It is a large sheet of galaxies measuring 70 Mpc by 200 Mpc. They provide fundamental information for understandingthedynamics, evolution and formation of spiral galaxies. rotation curves of spiral galaxies are a major tool for determining the distribu- tion of mass in spiral galaxies, we stress the observations rather than the mass determinations or the deconvolutions into luminous and dark matter. D) It is the time before the universe started expanding, about which we can never know anything. more galaxies or even quasars.

Most galaxies have rotation curves that show solid body rotation in the very center, following by a slowly rising or constant velocity rotation in the outer parts.

Explanation of galaxy rotation curves, designed to supplement a nonmathematical introductory astronomy course. We describe various methods to derive rotation curves, and review the results obtained. E) It is an enormous intergalactic cloud of dust and gas that hides more distant galaxies. They provide fundamental information for understanding the dynamics, evolution, and formation of spiral galaxies. In 1959, Louise Volders used the same telescope to demonstrate that the spiral galaxy M33 also does not spin as expected according to Keplerian dynamics. A companion paper by Maarten Schmidt showed that this rotation curve could be fit by a flattened mass distribution more extensive than the light. We discuss the basic characteristics of observed rotation curves in relation to various galaxy … Rotation curves of spiral galaxies are the major tool for determining the distribution of mass in spiral galaxies. Very few galaxies show any evidence for Keplerian decline. A flat rotation curve implies that the mass continues to increase linearly with radius. Abstract Rotation curves of spiral galaxies are the major tool for determining the distribution of mass in spiral galaxies.

We describe various methods to derive rotation curves and review the results obtained.