| |
| | Space exploration (Site not responding. Last check: 2007-09-19) |
 | | During the 20th century, with the development of adequate propulsion technologies, stronger and lighter materials andother technological and scientific breakthroughs, the idea of outer-earth missions was no longer a dream, but a viablepractice. |
 | | From a spaceflight perspective, the definition of space usually used is that space begins 100 km (62 miles) above Earth'ssurface. |
 | | As forsub-orbital flights, on October 3, 1942 anA4 rocket, a prototype for the German V2 rocket bomb, became the first successfullaunch of an object into space. |
| www.therfcc.org /space-exploration-14095.html (294 words) |
|