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A meteor is the visible path of a meteoroid that enters the Earth's (or another body's) atmosphere, commonly called a shooting star or falling star. The visibility is due to the heat produced by the ram pressure (not friction, as is commonly assumed) of atmospheric entry. A very bright meteor, brighter than the apparent magnitude of Venus, may be called a fireball or bolide.
If a meteoroid survives its transit of the atmosphere to come to rest on the surface, the resulting object is called a meteorite. A meteor striking the Earth or other object may produce an impact crater.
Molten terrestrial material "splashed" from such a crater can cool and solidify into an object known as a tektite.
Meteor dust particles left by falling meteoroids can persist in the atmosphere for up to several months. These particles might affect climate, both by scattering electromagnetic radiation and by catalyzing chemical reactions in the upper atmosphere.
Satellite re-entries can be quite spectacular and viewed by large numbers of people as the craft will often be seen over a few hundred to a few thousand kilometers before it finally succumbs. For example Sputnik 2 was witnessed by many people during its descent on 14th April, 1958. In the ten minutes it took to travel from over New York to the Amazon, it descended from 130 km to around 60 km, leaving a trail of `sparks' some 100 km long, the satellite itself a multitude of brilliant colors.
Skyhook ballons were balloons developed Otto C. Winzen and used by the United States Navy Office of Naval Research in the late 1940s and in the 1950s for atmospheric research, especially for constant-level meteorological observations at very high altitudes. Instruments like the Cerenkov detector were first used on skyhook balloons.
A weather balloon is a balloon which carries instruments aloft to send back information on atmospheric pressure, temperature, and humidity by means of a small, expendable measuring device called a radiosonde. To obtain wind data, they can be tracked by radar, radio direction finding, or navigation systems (such as the satellite based Global Positioning System).
The balloon itself produces the lift, and is usually made of a highly flexible latex material. The unit that performs the actual measurements and radio transmissions hangs at the lower end of the string, and is called a radiosonde. Specialized radiosondes are used for measuring particular parameters, such as determining the ozone concentration.
Before launch, the balloon is commonly filled with helium (though hydrogen can be used as a substitute) gas. The ascent rate can be controlled by the amount of gas the balloon is filled with. Weather balloons may reach altitudes of 40 km (25 miles) or more, limited by diminishing pressures causing the balloon to expand to such a degree (typically by a 100:1 factor) that it disintegrates. The instrument package is usually lost. Above that altitude sounding rockets may be used.
High clouds (Family A)
These generally form above 16,500 feet (5,000 m), in the cold region of the troposphere. However, in Polar regions they may form as low as 10,000 ft (3,048 m). They are denoted by the prefix cirro- or cirrus. At this altitude water almost always freezes so clouds are composed of ice crystals. The clouds tend to be wispy, and are often transparent.
Middle clouds (Family B)
These develop between 6,500 and 16,500 feet (between 2,000 and 5,000 m) and are denoted by the prefix alto-. They are made of water droplets, and are frequently supercooled.
These are found up to 6,500 feet (2,000 m) and include the stratus (dense and grey). When stratus clouds contact the ground they are called fog.
Vertical clouds (Family D)
These clouds can have strong upcurrents, rise far above their bases and can form at many heights.
Other clouds
A few clouds can be found above the troposphere; these include noctilucent and polar stratospheric or nacreous clouds which occur in the stratosphere and mesosphere respectively.
A sundog is a relatively common atmospheric optical phenomenon associated with the reflection/refraction of sunlight by the numerous small ice crystals that make up cirrus or cirrostratus clouds.
When Project Grudge hired Hynek, he was initially skeptical of UFO reports. Hynek suspected that UFO reports were made by unreliable witnesses, or by persons who had misidentified man-made or natural objects. In 1948, Hynek said that the “the whole subject seems utterly ridiculous”, and described it as a fad that would soon pass. (Schneidman and Daniels, 110) Hynek was a member of the Robertson Panel, which concluded that there was nothing anomalous about UFOs, and that a public relations capaign should be undertaken to debunk the subjet and reduce public interest.
Eventually, however, after examining hundreds of UFO reports (including some made by credible witnesses, including astronomers, pilots, police officers, and military personnel) Hynek concluded that some reports represented genuine new empirical observations. When the fad did not pass and UFO reports contiuned at a steady pace, Hynek devoted some time to studying the reports and determined that some were deeply puzzling, even after considerable study. He once said, "As a scientist I must be mindful of the past; all too often it has happened that matters of great value to science were overlooked because the new phenomenon did not fit the accepted scientific outlook of the time."
Originally posted by Gazrok
There's a great quote in there...thanks for the new sig!
Originally posted by HowardRoark
You also left out the late Carl Sagan
by Carl Sagan
"Extraordinary claims require extraordinary evidence".
Yeah, it's an enlightening statement, from mr. swamp gas himself.
A lot of people never forgave him for that one.
"Aliens" observed in the New Mexico desert were actually anthropomorphic test dummies that were carried aloft by U.S. Air Force high altitude balloons for scientific research.
Originally posted by Dulcimer
Also don't forget the most common mistaken object for crashed alien bodies are anthropomorphic dummies.
As mentioned in the Roswell Report.
www.af.mil...
"Aliens" observed in the New Mexico desert were actually anthropomorphic test dummies that were carried aloft by U.S. Air Force high altitude balloons for scientific research.
Also another thing I wanted to bring up (rambling) was a test done on the accuracy of eye witnesses.
I remember seeing a show on TLC or Discovery where they did a fake crash scene and had witnesses walk through it and then later ( I forget how much later ) they were asked questions on what they saw.
I didn't mention it in the thread because I had few details. Although one link in the thread does mention a similar study.
"SWAMP GAS", sometimes called "will-o-the wisp" or "foxfire" and even "wetland flatulence" is a naturally occurring phenomena caused by decaying organic matter transforming into a gaseous state and on extremely rare occasions takes on certain properties of luminescence. In the 1950's many UFO skeptics used this uncommon swamp gas occurrence to dismiss numerous sightings of weird lights and objects in the sky.
The public was often skeptical of Air Force
explanations attributing UFO sightings to swamp gas, weather
balloons or other natural phenomena.