Gina is trying to describe the force that both holds the Milky Way galaxy together and holds the Milky Way galaxy to other galaxies together in a cluster. Gina is describing

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Hagrid

Gina is describing the gravitational force. The heavier the body is, the stronger its gravitational pull. Just like Milky Way Galaxy, there is a gravitational pull because it is to other galaxies. Also, other galaxies are heavier than the earth and therefore, it is attracted to the Milky Way galaxy because of its gravitational pull.