Come hang out with Institute of Science astronomers and members of the Warren Astronomical Society, April 21 from 1-4 p.m. at the Cranbrook Institute of Science for International Astronomy Day. Learn how to use a telescope, build a star chart, examine stellar fingerprints, explore the Universe in the Acheson Planetarium and view the sun safely in our observatory. All activities, except planetarium programs, are free with general museum admission.