Part 1 of Essay
One hundred years from now, NASA's space program will not be so far advanced that people will be able to beam around the Universe or travel through time. However, unless something goes terribly wrong with the world, it is expected to advance tremendously. New, high-tech designs for rockets will make them more environment ....

Part 2 of Essay
.... very helpful tool for cleaning our homes. The pacemaker is a form of life-support on spacecrafts, helping astronomers' hearts pump while they are outside of the Earth's atmosphere. It is used, on Earth, for those who's hearts have problems with pumping blood. Pens that write upside-down are used in space, where there is no gravity and writing with pens would otherwise be impossible. They are convenient tools on Earth when we are trying to write on vertical surfaces. A zero-gravity training system is used to ....