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absorption spectrum - the distribution of energy falling on a particular surface that is absorbed by that surface.

atmosphere - a mixture of gases held in a layer surrounding the Earth by the Earth's gravitational force

  ©Copyright 2003 Carnegie Mellon University
This material is based upon work supported by the National Science Foundation under Grant Number 9653194. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.