A free public presentation by astronomer John Johnson, an assistant professor of astronomy at the California Institute of Technology, will be given at 8 p.m. on Monday, Aug. 16, in room 101 Thomas Building on the Penn State University Park campus. His talk on the study of planets in orbit around other stars is titled "Other Worlds." For more information, visit http://www.science.psu.edu/news-and-events/2010-news/AstronomyLecture8-2010.