Community Invited to JJC Planetarium to Learn about What Chemicals are in Stars and Galaxies Dec. 2

The public is invited to celebrate the 2015 International Year of Light at the Joliet Junior College Herbert Trackman Planetarium by attending a special show about what stars and galaxies are made of on Wednesday, Dec. 2 from 6 to 7 p.m. on the Main Campus, 1215 Houbolt Road in Joliet.

The show will teach attendees about how astronomers use the spectrum of an astronomical object to determine its chemical composition. During the first part of the show, audience members will see the spectrum of the filament of a bulb, and the spectra of the gases of hydrogen, neon, mercury, and more. These examples will be used to explain how astronomers tell the chemical composition of stars, nebulae and galaxies.

The second part will feature a sky tour with JJC’s new Omnistar digital planetarium projector to show the highlights of the Dec. 2 night sky.

For more information on the show, please contact Prof. Noella Dcruz at 815-280-2572 or

All shows at the planetarium are free to the public. To find out about visiting JJC‘s Herbert Trackman Planetarium, visit or call 815-280-2601.

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