Product Information Can't remember what an absorption line is? Not sure which planet is second closest or eighth furthest from the sun? Wondering what the Harvard Spectral Sequence criteria is? This student sized, double-sided, astronomy chart provides quick and easy reference to everything from basic astronomy definitions and conversion factors to celestial mechanics and the Hertzsprung-Russell Diagram. Laminated for protection against spills and other damage. Tell a Friend about this item
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