Surprisingly fast orbital speeds are seen for stars that are far from its galactic center. Dark matter makes up most of the Milky Way's mass.
It's the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term that refers to how much matter is there in a body. The kilogram is indeed the SI mass unit. (kg).A body's mass doesn't really alter anywhere at point in time.
mass. [măs] A measurement of the volume of matter in or making up a physical body. According to classical mechanics, an object's mass influences both the force needed to accelerate it.
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