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Why do astronauts think there is a great amount of mass in the halo of the milky way?

User Shunji Lin
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maybe because theirs a greater force at the milky-way there is less gravity in other parts of the space beyond were we are at!  
User Leon Vismer
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A great disk made of stars orbiting a central point in the disk. ... Mass of Milky Way ... The halo of the Milky Way contains the oldest-known objects in the ... Astronomers think that the galaxy started out as a spherical cloud in space. ... galaxies, that emit as much or more energy in radio wavelengths then they do in visible light
User PBJ
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