In its pursuit of missions that will take us back to the moon, to Mars, and beyond, NASA has been exploring a number of next-generation propulsion concepts. Whereas existing concepts have their advantages - chemical rockets have high energy density and ion engines are very fuel-efficient - our hopes for the future hinge on us finding alternatives that combine efficiency and power.
In its pursuit of missions that will take us back to the moon, to Mars, and beyond, NASA has been exploring a number of next-generation propulsion concepts. Whereas existing concepts have their advantages - chemical rockets have high energy density and ion engines are very fuel-efficient - our hopes for the future hinge on us finding alternatives that combine efficiency and power.
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