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Free 2016 Space Wall CalendarNo Longer AvailableExpired: Sep 3, 2015 11:05pm | Comments 5
FREE 2016 Space Wall Calendar from the Chandra X-Ray Observatory - To request your FREE 2016 "Space" Wall Calendar from the Chandra X-Ray Observatory, go here then fill out the form on the right side of the page. Limit one per household while supplies last.
Chandra X-ray Observatory
Chandra X-ray Observatory is a telescope specially designed to detect X-ray emission from very hot regions of the Universe such as exploded stars, clusters of galaxies, and matter around black holes. Because X-rays are absorbed by Earth's atmosphere.