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Originally posted by weedwhacker
reply to post by ppk55
As it already shows very, very clearly that there is no air, but instead a vacuum on the Moon...it is evident by the behavior of the feather.
Originally posted by ppk55
What I can't work out is why the feather bounces when it hits the ground, and then why it rolls over.
Originally posted by Phage
Because it falls faster than it would in atmosphere, it builds up more momentum which allows it to rebound. Drop a pin. It weighs less than a good sized feather. Does it bounce?
If the feather bounced, why didn't the hammer ?
Originally posted by ppk55
Originally posted by weedwhacker
reply to post by ppk55
As it already shows very, very clearly that there is no air, but instead a vacuum on the Moon...it is evident by the behavior of the feather.
I think we all know there is no air on the moon.
What I can't work out is why the feather bounces when it hits the ground, and then why it rolls over.
Feathers don't just roll over when they hit the ground in 1/6 gravity.
Originally posted by Tomblvd
Originally posted by FoosM
12 hours notice for what? Solar Flares? Not likely.
They are unpredictable.
Plus radiation comes from all sides, so no, repositioning the craft will do no good.
Well, this quote proves beyond a shadow of a doubt you do not know a thing about radiation, and the differing types that are present in space.
The radiation from a solar flare comes from only ONE direction. I'll let you use your imagination to figure out what direction that is.
If you don't understand that simple, basic fact, you know nothing about radiation, and any further writings by you can be summarily dismissed.
I would encourage everyone to save that clueless statement and repost it as a response everytime Foos tries to expound on the "dangers of radiation".
Two types of radiation are particularly significant: solar flare protons, and high-energy galactic cosmic rays (GCR). Solar flare protons come in bursts, lasting a day or so, following an energetic solar event. The proton flux is omnidirectional; although the source of the radiation is solar, the actual radiation comes from all directions, and
hence the spacecraft must be shielded in all directions, and not just in the direction of the sun.
In the absence of shielding, a single large solar flare would likely be fatal to the crew, either immediately or as a result of cancers induced by the radiation dose. Cosmic rays are a continuous background consisting of extremely high energy heavy nuclei, and are also omnidirectional.
An Apollo command module with its aluminum hull would have attenuated the 1972 storm from 400 rem to less than 35 rem at the astronaut's blood-forming organs. That's the difference between needing a bone marrow transplant or just a headache pill.
Modern spaceships are even safer. "We measure the shielding of our ships in units of areal density--or grams per centimeter-squared," says Cucinotta. Big numbers, which represent thick hulls, are better:
The hull of an Apollo command module rated 7 to 8 g/cm2.
On the Apollo missions, the approach to crew protection was simple: on notification of a large solar flare, the mission would be aborted to Earth. Since the missions were short, the cumulative fluence of galactic cosmic rays was not significant.
Originally posted by FoosM
Two types of radiation are particularly significant: solar flare protons, and high-energy galactic cosmic rays (GCR). Solar flare protons come in bursts, lasting a day or so, following an energetic solar event. The proton flux is omnidirectional; although the source of the radiation is solar, the actual radiation comes from all directions, and
hence the spacecraft must be shielded in all directions, and not just in the direction of the sun.
In the absence of shielding, a single large solar flare would likely be fatal to the crew, either immediately or as a result of cancers induced by the radiation dose. Cosmic rays are a continuous background consisting of extremely high energy heavy nuclei, and are also omnidirectional.
www.islandone.org...
Now, maybe your interpretation of 'omni-directional' is different than mine, and if it is, we will just have to agree to disagree. Maybe you and others also want claim that solar flares are not deadly to astronauts without sufficient shielding. Then you and I will have to agree to disagree on the definition of 'fatal'.
On the Apollo missions, the approach to crew protection was simple: on notification of a large solar flare, the mission would be aborted to Earth. Since the missions were short, the cumulative fluence of galactic cosmic rays was not significant.
Originally posted by Chadwickus
Analysis of the dark basalt material indicated a close resemblance to soil recovered by the American Apollo 12 mission. [Wikipedia, no external reference]
So we have a Russian probe that returned soil samples from the moon, these samples have a close resemblance to soil samples brought back from Luna 12.
Originally posted by Chadwickus
So we have samples returned by Apollo 12 that are nearly identical to samples returned by Soviet Luna 16.
Originally posted by Chadwickus
Soviet Luna 16 soil samples that were returned to earth and the fact that those samples were almost identical to the samples returned by Apollo 12.
Originally posted by cluelessnoob
he isnt aussie, lol he sounds like little lord fauntleroy. he's as english as they come. But keep going mate, yr doing an excellent job.
Originally posted by Phage
The fringe of the Van Allen Belt was traversed. Exposure was limited and at acceptable levels.
Apollo astronauts, however, were forced to traverse the most intense regions of the Belts in their journey to the Moon. Fortunately, the travel time was only about 30 minutes so their exposures were not much more than the total dose received by Space Shuttle astronauts (TBD).
There were no proton events. Had there been, appropriate measures would have been taken (as pointed out). It was a calculated risk.
The odd numbered cycles tend to be more intense than their preceding even numbered cycles, and the general trend of cycle amplitudes was increasing up to cycle #23. For this reason, many researchers thought that cycle#23 might have exceeded cycle 22, the third largest in recorded history, which peaked in 1989, and could have been larger than cycle #19, which was the largest in recorded history and which peaked in 1957-8...
Galactic cosmic rays are of high energy but low intensity. The level of exposure was acceptable.
All of this has been gone through. More than once, but you're hung up on the windows. Since you provided this as a source (which you did not credit), I'm sure you are aware that the CM windows had an outer heat shield pane. Why didn't you mention it? Never mind, let's have a look. These were made of fused amorphous silica, 0.7" thick.
0.7" = 17.78mm
Let's add the inner panes. We'll use the thinnest ones.
17.78 + 5.08 + 5.08 = 27.94mm
That's a lot of glass.
The X-rays (for example) are absorbed by glass with minimum amounts of heavy oxides (lead, barium or strontium).
The presence of lead is used in glasses absorbing gamma radiation and X-ray
Fused silica is the only one of the six categories that contains a single composition. This glass consists simply of silica (silicon dioxide) in the noncrystalline, or amorphous, state. Fused silica, most expensive of all glasses, offers the maximum resistance to thermal shock as well as the highest permissible operating temperature (900°C for extended periods, to 1,200°C for short periods). It also has maximum transmission in the ultraviolet range...
Six months' exposure to the wind of high-energy particles streaming from the sun could indeed prove deadly.
Originally posted by FoosM
So this issue still stands:
“the windows installed on the spacecraft would provide the astronauts basically no protection against the deep space deadly radiation and any attempt to travel beyond earth’s inner orbit would mean instant death for the astronauts.”
www.newscientist.com...