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Old 10-November-2008, 12:15 AM
DRAKCIPS DRAKCIPS is offline
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Default light on earth

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Why is the earth always enshrouded in darkness and no light from the sun radiates the space between them, only the surface is illuminated?
If a scale model were made i think it would demonstrate that light from the sun would be present but would also reveal somthing between the planets.
After all we see the moon in day light and darkness. Ive never seen the earth in day light except from my point of view down here.
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Old 10-November-2008, 12:28 AM
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Answered in duplicate posting
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Old 10-November-2008, 01:15 AM
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I'm copying the relevant portion of my response in the other thread:

Quote:
Originally Posted by DRAKCIPS
Why is the earth always enshrouded in darkness and no light from the sun radiates the space between them, only the surface is illuminated?
Welcome to BAUT. There isn't much in space around the Earth, so there isn't much to reflect the sun's light. There is some dust, however, and this causes what we call zodiacal light:

Quote:
The zodiacal light is produced by sunlight reflecting off dust particles in the solar system known as cosmic dust. Consequently, its spectrum is the same as the solar spectrum. The material producing the zodiacal light is located in a lens-shaped volume of space centered on the sun and extending well out beyond the orbit of Earth. This material is known as the interplanetary dust cloud. Since most of the material is located near the plane of the solar system, the zodiacal light is seen along the ecliptic.
Since the dust is so thin, the reflected light is very faint, so will only be seen under careful and specific observation conditions, but it is there.
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Old 10-November-2008, 01:26 AM
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Oh, a question in return: Is there a conspiracy theory being advocated, or is this an astronomy question?
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Old 10-November-2008, 01:43 AM
DRAKCIPS DRAKCIPS is offline
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honest question-logical answer given. However, it is assumed there is stuff out there be it satilites or rocks somthing. the media pertrays stuff out there. it seems like somthing would show up.
recently i have been questioning accepted teachings and one Q leads to another.
pics often seem air brushed or not real.
Needless to say i have little confidence in man accept for his ability to lie and oppress.
thx 4 reply
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Old 10-November-2008, 01:52 AM
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Needless to say i have little confidence in man accept for his ability to lie and oppress.
I can't believe you would say that
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Old 10-November-2008, 04:35 AM
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One thing the Hitchhiker's Guide to the Galaxy gets right:
Quote:
Space is big. Really big. You just won't believe how vastly hugely mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space.
And in all that bigness, even planets are small. Media portrayals of densely crowded asteroid fields are total fiction, portrayed like that for dramatic purposes. (Well, about the only place you'd find stuff like that would be in the debris disc of a forming solar system. Not in a mature system.)

Please, give us some specifics about what makes you doubt.

Fred
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Old 10-November-2008, 03:54 PM
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pics often seem air brushed or not real.


Stop reading Penthouse.
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Old 10-November-2008, 04:45 PM
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However, it is assumed there is stuff out there be it satilites or rocks somthing. the media pertrays stuff out there. it seems like somthing would show up.
Something does show up. Satellites can be seen with the unaided eye. They look like moving stars. The Iridium satellites are expecially spectacular, often outshining everything in the sky and visible even in daylight. Rocks can be seen if you have a telescope, though they look like nothing more than points of light. The things that show up are tiny and very VERY widely spaced. That's why the sky is so dark. The Moon is thousands of kilometres across but hundreds of thousands of kilometres away, so it seem quiter small. Venus is thousands of kilometres across and millions of kilometres away, and even among the asteroids there is not a lot closer to us than Venus gets.

It's all about scale. There is trillions of tons of matter out there, but it is spread over vast VAST volumes of space.

Quote:
pics often seem air brushed or not real.
Do you have any specific examples of pics you find suspect? And by what criteris do you assess their 'not real' appearance? Are you willing to accept your own preconceptions may be in error?

Quote:
Needless to say i have little confidence in man accept for his ability to lie and oppress.
How very very sad. I guess we should discount creativity, engineering, medicine etc.
thx 4 reply[/QUOTE]
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Old 10-November-2008, 05:20 PM
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WRT: The "airbrush" or seemingly fake photos, also keep in mind that the spectacular photos of nebulae and other astronomic phenomenon are typically displayed in false-color. Sometimes it's to represent the different gasses/elements that make up the objects, or the differing spectrum of photons emitted outside the visible light range. Sometimes it's purely for artistic purposes. The objects are indeed there; they just don't look like the photos to the naked eye.
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Old 10-November-2008, 06:15 PM
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Quote:
Originally Posted by Fazor View Post
WRT: The "airbrush" or seemingly fake photos, also keep in mind that the spectacular photos of nebulae and other astronomic phenomenon are typically displayed in false-color. Sometimes it's to represent the different gasses/elements that make up the objects, or the differing spectrum of photons emitted outside the visible light range. Sometimes it's purely for artistic purposes. The objects are indeed there; they just don't look like the photos to the naked eye.
And also taken in wavelengths or with instruments where clear, sharp-edged images can not be obtained. One illustration of how an object might appear "airbrushed" due to optical flaws or limitations:
http://en.wikipedia.org/wiki/Image:I...after_SMM1.jpg

Many interesting objects are just beyond the limits of current equipment and can not be imaged clearly. Also, even when clear images are possible, very different physics are involved in the formation of nebulae and such. With photon pressure, heating from stars and collisions with other bodies of gas, self gravitation, shock waves, etc, and the enormous scales involved, things do not behave much like clouds in the sky. Speaking of which...take a close look at those sometimes, particularly around dawn or dusk. They can often look horribly fake, despite being quite certainly real (unless you feel like positing a conspiracy hiding the fact that the sky's a computer generated projection).
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Old 10-November-2008, 07:48 PM
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Also photos of nebulas are time exposures, capturing light over time which is too faint for your eye to see in real time. If you have access to a good telescope, get a look at Orion's sword where the famous nebula is. You've seen brilliant photos of it in glorious color, but live, in a telescope, it's just a faint gray cloud. Experts correct me if I'm wrong, but I think even if you were close enough for it to fill the sky, it would still be pale and gray. Also CMIIAW, but I think the famous Horsehead Nebula is scarcely visible at all in real time and can only be seen with a time exposure?
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Old 10-November-2008, 07:54 PM
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Experts correct me if I'm wrong, but I think even if you were close enough for it to fill the sky, it would still be pale and gray.
Expert confirmation: BA Blog: What does a nebula look like up close?

Quote:
A while back, during one of my video live chats, I was asked what star I’d like to see up close. That’s a good question, so I recorded my answer. It morphed into a discussion of what a nebula, an interstellar gas cloud, would look like if you traveled up close to one. [Links to Bad Astronomer YouTube video, about 3 minutes.]
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Old 16-November-2008, 04:10 AM
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Quote:
Originally Posted by MAPNUT View Post
Also photos of nebulas are time exposures, capturing light over time which is too faint for your eye to see in real time. If you have access to a good telescope, get a look at Orion's sword where the famous nebula is. You've seen brilliant photos of it in glorious color, but live, in a telescope, it's just a faint gray cloud. Experts correct me if I'm wrong, but I think even if you were close enough for it to fill the sky, it would still be pale and gray. Also CMIIAW, but I think the famous Horsehead Nebula is scarcely visible at all in real time and can only be seen with a time exposure?
Through a decent telescope, the Orion nebula can look spectacular. You can pick out subtle cloud detail and on dark nights it has a pale greenish hue since that is the color our eyes are most sensitive to. Through a very large telescope, on an exceptional night away from light pollution, you can see faint red highlights. Don Davis has some color sketches of the Orion Nebula at the bottom of this page.

The Horsehead nebula is infamously hard to see visually, but with a proper filter and a decent sized telescope, you can see it. Of course, it is easier in large telescopes, but there are reports of it being seen in surprisingly small telescopes.

You are right that nebulae become dimmer and more diffuse when you get closer to them, I've never had a precise answer to whether you could actually see them up close though. You probably wouldn't be able to see color.
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Old 19-November-2008, 06:56 AM
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Quote:
Originally Posted by DRAKCIPS View Post
honest question-logical answer given. However, it is assumed there is stuff out there be it satilites or rocks somthing. the media pertrays stuff out there. it seems like somthing would show up.
It does show up.
What the Heck do you think Astronomers are looking at?!
When you see the Moon, an asteroid- whatever- it's reflecting the light from the Sun.
When you are standing in a room and the lights are on- do you SEE the light IN the air?
Hello.
You see whatever reflects the light.


Quote:
Originally Posted by DRAKCIPS View Post
recently i have been questioning accepted teachings and one Q leads to another.
pics often seem air brushed or not real.
Needless to say i have little confidence in man accept for his ability to lie and oppress.
thx 4 reply
When reflecting on what you see outside

Speaking of reflections......
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