Astronomy: images of the Universe: Figure 4 The radial surface brightness profiles of (a) a star (i.e. a point source) and (b) a galaxy (an extended source).

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Astronomy: images of the Universe

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Figure 4 The radial surface brightness profiles of (a) a star (i.e. a point source) and (b) a galaxy (an extended source).

1.2 Measuring brightness

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