18-25


Galaxies

0
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Planetary Nebulae

0
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The Hertzsprung Russel (HR) diagram

0
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Color in Astronomy

3
Average: 3 (1 vote)
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CDD PHOTOMETRY

0
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Quasar Optical Variability

3
Average: 3 (1 vote)
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RotCurve-Applet (rotation curves of spiral galaxies)

3
Average: 3 (1 vote)
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