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The Gravitational Effects of Gravity
Gravity is sensitive to everything. It doesn't matter whether we can see it or not, the pull of gravity is just there. Weight and mass as we learn from Newton and Galileo are one and the same thing. So when we talk about weighing something, it just means measuring how much gravitating mass the object contains. The great thing about elliptical galaxies is that they're much more massive in spiral galaxies. There's much more dark matter there.