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Just six miles of atmosphere separates mankind from outer-space. In fact, a rocket can travel from the surface of our planet to space in just five minutes. In space, everything is different. With no atmosphere, the human eye can literally see for hundreds of miles. Space is not an empty vacuum, 99% of all matter exists in space, it's invisible and is called dark matter. The space around planet earth is full of invisible radio waves, the signals from our television, radio and telephone networks travel extremely fast in space. Every month planet earth sends out over one trillion individual radio broadcasts, which reach the planet Saturn within 11 days of leaving the surface of planet earth.
For the last 30 years, mankind has been sending small probes into space. The oldest of these probes (voyager I, voyager II, an the pioneer probes) were launched 30 years ago and have now left the solar system. The pioneer and voyager probes are fitted with a gold plaque which contains a map of how to find planet earth, a diagram of what we look like and an audio recording from the secretary general of the united nations. (an ex-Nazi named Kurt Waldheim. His voice is on a solid gold disc attached to the satellites.
Gold disc on space shuttle voyager
Just six miles of atmosphere separates mankind from outer-space
radio and telephone networks travel extremely fast in space
Originally posted by acroagogue
reply to post by Phage
Weather you believe it or not, radio frequencies travel into space. I'll debate you in person any time if you think you know so much .
Service Ceiling (737-900) 41,010 ft (12,500 m)
Von Karman decided that there must be a definitive line drawn in the sky where aeronautics effectively ended and astronautics began. Together with an obscenely large group of fellow scientists, Von Karman spearheaded a study that would create such a line. In the end, it was decided, after several complex calculations, that the line could be set at roughly 100 kilometers above sea level (in truth, the actual answer was probably something a little higher or lower than this, but Von Karman, in his wisdom, decided to opt for a round number so that it might be easily remembered). And thus, this imaginary line, 100 kilometers off the Earth, 20 kilometers above the mesosphere and well into the thermosphere, became the official boundary between the Earth and outer space. This line became known, naturally, as the Karman Line.