Human exploration of the solar system has stagnated since the last Apollo mission to the moon, and with no sailors straying far from shore, no ships have been built toward those ends; rather than a starship Enterprise (or at least a step in that direction), there was a shuttle Enterprise - a spaceship that never went into space.
Work is now underway, however, to again send humans beyond low Earth orbit, to send human explorers out into the solar system. Whereas the last 40+ years have been spent going in circles, the next 40+ years offer the promise of heading out into the frontier - and this time, to stay.
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