During more than 40 years of spaceflight, a lot of things have changed.
Today’s Space Shuttle is a luxury ship compared to the Mercury capsules that
carried the first American astronauts into space. Forty years ago, a lot of
people might have had a hard time believing that Americans and Russians would be living together in space on one Space Station. Space probes have visited every
planet except Pluto, and a mission there is currently being planned.
One thing that has changed very little, however, is the way rockets work.
While different fuels have been used, and current rocket engines are more
high-tech than their early predecessors, the basic concepts involved are
basically the same. But, NASA researchers are currently working on a way to
change that, as well…