CAPE CANAVERAL, Fla. – The manager of NASA's Commercial Crew Program CCP, Ed Mango, hosts a virtual conversation, called a Tweet Chat, with Twitter followers from around the world. Those who follow www.twitter.com/commercial_crew had an hour-long opportunity to ask Mango questions about NASA’s efforts to get astronauts to low Earth orbit and the International Space Station aboard American rockets and spacecraft. Mango stuck to the social networking service's 140 character limit and answered dozens of questions. At left, is Brittani Sims, a member of the CCP team. The goal of CCP is to drive down the cost of space travel as well as open up space to more people than ever before by balancing industry’s own innovative capabilities with NASA's 50 years of human spaceflight experience. Seven aerospace companies are maturing launch vehicle and spacecraft designs under the program’s second round of development, called Commercial Crew Development Round 2 CCDev2), including Alliant Techsystems Inc. ATK, The Boeing Co., Excalibur Almaz Inc., Blue Origin, Sierra Nevada, Space Exploration Technologies SpaceX, and United Launch Alliance ULA. For more information, visit www.nasa.gov/commercialcrew. Image credit: NASA/Gianni Woods KSC-2012-2645