In accordance with President Obama's new approach to space exploration, NASA has awarded $50 million contracts to five different companies that are working to develop new propulsion systems for spaceflight. Arguing the case that the chemical rockets that have powered spaceflight to date have probably reached the limit of what they can do is certainly possible, which would mean new propulsion methods must be found.
The Obama plan is to develop the technology and space infrastructure that will support a sustained space exploration program sometime in the future instead of focusing on reaching a location. Many critics argue, however, that having a specific goal gives direction to the overall effort.
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