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Fig. 2.26
The types of objects shown in the circular map of the universe
Fig. 2.27
The center of the circular map of the universe
Earth. For example, artificial satellites are orbiting the Earth 10,000-100,000 km
above the Earth. The distance between the Sun and the Earth is one astronomical unit
(AU). Space probe Pioneer 10 was about 100 AU away from the Earth at the time
of the SDSS survey. Sirius, the brightest star in the sky, is slightly over one parsec
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