BRIEFLY : SCIENTIST TO SPEAK ON ASTEROID THREATS.Alan W. Harris, senior research scientist for the Jet Propulsion jet propulsion, propulsion of a body by a force developed in reaction to the ejection of a high-speed jet of gas. Jet Propulsion Engines The four basic parts of a jet engine are the compressor, turbine, combustion chamber, and propelling nozzles. Laboratory's Earth and Space Sciences Division, will present an illustrated talk about the hazard of asteroids This is a list of numbered minor planets, nearly all of them asteroids, in sequential order. As of late September 2007 there are 164,612 numbered minor planets, and many more not yet numbered. Most asteroids are ordinary and not particularly noteworthy. hitting the Earth. Harris will describe past impacts on the Earth, including the theory that an asteroid strike led to the extinction of dinosaurs. He will talk about how often collisions of various sizes occur, and what happens when they do. Harris has degrees from the California Institute of Technology California Institute of Technology, at Pasadena, Calif.; originally for men, became coeducational in 1970; founded 1891 as Throop Polytechnic Institute; called Throop College of Technology, 1913–20. and the University of California, Los Angeles UCLA comprises the College of Letters and Science (the primary undergraduate college), seven professional schools, and five professional Health Science schools. Since 2001, UCLA has enrolled over 33,000 total students, and that number is steadily rising. , in Earth and space science, and has worked with the National Aeronautics and Space Administration National Aeronautics and Space Administration (NASA), civilian agency of the U.S. federal government with the mission of conducting research and developing operational programs in the areas of space exploration, artificial satellites (see satellite, artificial), to establish search programs for large objects coming close to the planet. The lecture is set for 8 tonight at the Placerita Canyon Nature Center, 19152 Placerita Canyon Road, Newhall. Admission and parking are free. For information, call (805) 259-7721. Programs to focus on raising children The Santa Clarita Parks, Recreation, and Community Services Department is offering two child-development classes beginning Monday. My Buddy and Me classes will meet weekly for 10 weeks. The Terrific Tots class is a co-operative program in which parents are required to help the instructor at least six times during the 12-week session. Classes will be held at a variety of times and locations around the Santa Clarita Valley The Santa Clarita Valley is the valley of the Santa Clara River in Southern California. It stretches through Los Angeles County and Ventura County. Its main population center is the city of Santa Clarita. The valley was part of the 48,612-acre (19,672. . For information, call (805) 286-4910. Library to host show on Mexican culture The Valencia Library will present Veto Ruiz and Mariachi Aztlan at 2:30 p.m. Sunday in a musical celebration of Mexico's independence and ethnicity. The program will be held in the library meeting room, 23743 W. Valencia Blvd., Valencia. Admission is free and refreshments will be served. For information, call (805) 259-8942. |
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