Which statement correctly describes the nucleus of the atom?
The nucleus of the atom contains the electrons
The nucleus of the atom is mostly empty space.
The nucleus of the atom surrounds the center of the atom.
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The nucleus of the atom contains most of the mass of an atom.

The picture below shows two galaxies. spiral galaxy and elliptical galaxy which of these statements best describes a similarity between the two galaxies? (2 points) both have elongated centers. both have centers shaped like bars. both change their shape from time to time. both are held together by gravitational forces.