Abstract
For an astronomer, there are really two forms of matter; visible and invisible. Visible matter emits electromagnetic radiation, which travels through space and is detected with telescopes. Invisible matter does not produce detectable amounts of radiation. The presence of invisible, or dark matter, can only be inferred through its gravitational effect. The study of visible matter enables us to infer the distribution of the dark matter whose gravity was responsible for the formation of the first stars and galaxies. In this chapter we explore the visible matter as seen in stars, galaxies and gas.
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