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Stars and Galaxies Our sun is a star. There are countless more like it in space. The sun is one of billions of stars that make up the Milky Way. The Milky Way is a Galaxy. A galaxy is a cluster of stars held together by the force of gravity. The stars in a galaxy are very far apart. It may take several years for a spacecraft to reach other planets in our solar system. It may take several centuries to reach other stars in our galaxy. Beyond the milky way there are other galaxies. Scientists believe there may be as many as 100 000 million other galaxies beyond ours. Because gravity attracts them together, the stars in a galaxy are clustered. This means there are vast expanses of nothing between different galaxies. Stars and Galaxies Our sun is a star. There are countless more like it in space. The sun is one of billions of stars that make up the Milky Way. The Milky Way is a Galaxy. A galaxy is a cluster of stars held together by the force of gravity. The stars in a galaxy are very far apart. Scientists believe there may be as many as 100 000 million other galaxies beyond ours. Because gravity attracts them together, the stars in a galaxy are clustered. There are vast expanses of nothing between different galaxies.