An online tutor for astronomy: The GEAS self-review library

@article{Vogt2015AnOT,
  title={An online tutor for astronomy: The GEAS self-review library},
  author={Nicole Paula Vogt and Amy Smith Muise},
  journal={Cogent Education},
  year={2015},
  volume={2}
}
Abstract We introduce an interactive online resource for use by students and college instructors in introductory astronomy courses. The General Education Astronomy Source (GEAS) online tutor guides students developing mastery of core astronomical concepts and mathematical applications of general astronomy material. It contains over 12,000 questions, with linked hints and solutions. Students who master the material quickly can advance through the topics, while underprepared or hesitant students… 
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