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Science Over the EdgeA Roundup of Strange Science for the MonthApplet credit: Ed Hobbs
September 2003 |
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In the News:
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What's New at the Museum:
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Ask the Curator:
Your right that much of the human body is tough, but the lungs are relatively fragile. Certainly not near the strength of a spaceship hull. Scuba divers have been dealing with these issues for years. The atmosphere of our planet at sea level pushes against us with the force of about 14.7 pounds per square inch (PSI). Ideally a spaceship would be pressurized the same, but NASA has used lower cabin pressures (around 5psi) during spaceflights (To do this you have to increase the percent of oxygen in the air so the astronauts can breath normally. This is increases the risk of fire, though. The three astronauts that died on the launch pad in 1965 were victims of a flash fire which was partly the result of using a cabin environment with a near 100% oxygen level). Let's look at an ideal spaceship that would contain 14.7psi. Can metal stand that kind of pressure? A typical scuba tank can withstand more than 3000 psi! Remember a spaceship cabin is just a big tank of air. Even the thin-walled propane tank on your gas grill can safely contain a pressure of 325psi - more than 21 times the pressure needed on our ideal spaceship. Now how about the human lung? Again we will go back to scuba divers. As you go down into the water the pressure becomes greater at a much faster rate than it does as you move down through air. The only way divers can breath underwater is by using air pressurized the same level as the water around them. For this reason divers must be very carefully to breath normally as they ascend. If they hold their breath they could rupture a lung because the air in the lung expands as they go upward. It has been shown that a lung can rupture if the diver is holding his breath and ascends as little as 4 feet. That's an increase of only 1.7psi. Much less than even the 5 to 14.7psi of a spaceship cabin and certainly much less than a metal hull of a spaceship can stand.
Another question that I have , why is it that Freedom Ridge in Nevada (10 miles from the area 51 facility) was closed in 1995? - Krista Foo fighters are what WW II aircraft crews called the unexplained glowing balls that seemed to follow their planes. At first they thought they might be some sort of enemy weapon, but they never attacked and after the war the Allies found out that the Germans had been seeing them too. There has never been a good explanation for what these objects were. For an full discussion of the foo fighters of WWII, click here. Since what you saw occurred in 1995 it might be hard to classify it as "foo fighters" in the technical sense, but you could probably list it as a UFO (unidentified flying object). Whether it is explainable or not by natural or man-made phenomena depends on exactly what you saw. As for Freedom Ridge, the government closed it because it gave the public too close a look at the facility at Groom Lake were secret military weapons are tested. Some people claim this is because the government is hiding crashed flying saucers there, but more likely it is because it could be used by foreign agents to gain information on sensistive aircraft or weapons systems under construction.
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In the Sky:
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Observed:
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On the Tube: Currently we are only able to give accurate times and dates for these programs in the United States. Check local listings in other locations.
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LGM: Science over the Edge ArchivesLGM Archive 1998, 1999, 2000, 2001, 2002, 2003. Copyright Lee Krystek 2003. All Rights Reserved. |