NASA may have retired its shuttles, but it has its sights on sending astronauts deeper into space than ever before.
These voyages are years away, but on Monday, astronauts are heading underwater to take part in a simulation that will help them figure out how they might explore one possible new destination: a near-Earth asteroid.
The shuttle Enterprise made a incredible trip up the Hudson River by barge, today. The shuttle was framed by New York City's skyline and eventually it will be hoisted from the barge to its new home at the Intrepid Sea, Air and Space Museum.
Here are some pictures from the Enterprise's journey:
Less than 250 years ago, the brightest minds of the Enlightenment were stumped over how far the Earth is from the sun. The transits of the 1760s helped answer that question, providing a virtual yardstick for the universe.