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The component of an astronomical object's relative velocity in the line of sight of an observer, i.e. in a radial direction towards or away from the observer.
A large, cool star that is going through subsidiary stages of nuclear reactions, having exhausted its hydrogen fuel supply.
red giant branch
A region on the Hertzsprung-Russell diagram in which red giants (luminous but cool stars in the later stages of their evolution) are found.
Materials, such as minerals and metals, that are present in Solar System bodies that require high temperatures in order to melt (cf. icy materials).