This week in Detroit, auto giant GM unveiled its newest hydrogen car prototype, the Sequel. In this hour, we'll take a look at the Sequel, and other green cars. Will hydrogen cars like the Sequel ever hit the showroom floor? And, when it comes to its environmental effects, how does your car match up? We'll go under the hood in this hour.

Plus, we'll get the latest on the Huygens space probe, headed toward Saturn's moon Titan. The probe is scheduled to enter Titan's atmosphere on Friday -- we'll get the latest from the mission control center in Germany.

Call in with your questions and comments at 1-800-989-8255 (3-4 Eastern). Teachers, find more information about using Science Friday as a classroom resource in the Kids' Connection.

Guests:
Richard Harris
Science Correspondent
National Public Radio
Washington, DC

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Ron Cogan
Editor and Publisher
Green Car Journal
San Luis Obispo, California

Tim Vail
Director, Business Development for Fuel Cell Activity
General Motors
Greenwich, Connecticut

Daniel Kammen
Class of 1935 Distinguished Chair in Energy, Energy and Resources Group & Goldman School of Public Policy
Director, Renewable and Appropriate Energy Laboratory
University of California
Berkeley, California

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This segment produced by Karin Vergoth