Notices
Results 1 to 20 of 20

Thread: The sky

  1. #1 The sky 
    Forum Professor
    Join Date
    Apr 2007
    Location
    In the circuitous haze of my mind
    Posts
    1,028
    I just noticed something. If you are in the right place on earth and you look up at the sky, you can see the universe, right? (something Ive only seen in pictures since I live in a big city )

    But when you look at pictures taken from the space shuttle you do not see any stars, at least in the ones that I've seen. Why is this?

    (Sorry if this is a stupid question)


    Reply With Quote  
     

  2.  
     

  3. #2  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,168
    The pictures from the space shuttle will feature either part of the space shuttle (very large bright object), the Earth (very large bright object), the ISS (very large bright object), etc. The camera lens is stopped down to such an extent that the comparatively faint stars are not viisble.


    Reply With Quote  
     

  4. #3  
    Forum Junior Twaaannnggg's Avatar
    Join Date
    May 2007
    Posts
    248
    Or in tech-lingo: the dynamic range of the cameras is not big enough to catch both the Sun/ISS/Earth and the faint stars at the samew time. Hoax Believers see pictures like this as "proof" that man was NOT on the moon
    Build a man a fire and he will be warm for a day, set a man on fire and he will be warm for the rest of his life.
    Reply With Quote  
     

  5. #4 Re: The sky 
    Moderator Moderator AlexP's Avatar
    Join Date
    Jul 2006
    Location
    NY
    Posts
    1,838
    Quote Originally Posted by Cold Fusion
    If you are in the right place on earth and you look up at the sky, you can see the universe, right?
    Not the universe...I believe what you can see is the Milky Way.
    "There is a kind of lazy pleasure in useless and out-of-the-way erudition." -Jorge Luis Borges
    Reply With Quote  
     

  6. #5  
    Forum Professor
    Join Date
    Apr 2007
    Location
    In the circuitous haze of my mind
    Posts
    1,028
    Yeah, Milky way, thats what I meant.

    I never thought of that...is the earth really that bright form space? And I guess that if they took a picture of the dark side of the earth(night) then the sun would be in the picture, unless, you used the earth the block the suns light, then you could possibly see the stars? What about a pic while the shuttle has the sun at its back, and is just on the line of sunlight across the earth, so that it catches a piece of the night side of earth, while facing the rest of the sky away from the sun?

    Even better....have they ever bothered to try to take a picture while the sun was being eclipsed by say, Saturn?

    So the only deficiency is in the camera; which means that an astronaut can see the sun and the rest of the sky? That must be an amazing sight, and more so since very few (200?) people have ever, and will ever (for a while) see from that perspective.
    Reply With Quote  
     

  7. #6  
    Forum Ph.D.
    Join Date
    Dec 2006
    Location
    Norway
    Posts
    927
    well.. our atmosphere is certainly bright enough to cancel out the light of the stars completely during daytime.
    keep in mind cameras usually have a pretty shitty light sensitivity.
    just take your camera out at night, and try and take pictures. they'll come out a lot darker than the real deal.
    now you can sit back, and wonder what REAL space is going to look like...

    all those stars like you've never seen them before, brighter than ever.. sigh.
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
    Reply With Quote  
     

  8. #7  
    Forum Ph.D. Cat1981(England)'s Avatar
    Join Date
    Sep 2006
    Location
    South Downs.
    Posts
    913
    If you get the chance you should go camping somewhere away from the city's. The number of stars that suddenly appear is truly inspiring, one of those things everybody should do before they die.
    Eat Dolphin, save the Tuna!!!!
    Reply With Quote  
     

  9. #8  
    Forum Professor
    Join Date
    Apr 2007
    Location
    In the circuitous haze of my mind
    Posts
    1,028
    Where I live theres a allot of after glow in the sky; in fact, its to such an extent that I actually have to draw my curtains in. (And the array of Hollywood/ party spot lights doesn't help)

    I need the go to the eastern Californian desert I guess; and bring a good camera.
    Reply With Quote  
     

  10. #9  
    Forum Junior Twaaannnggg's Avatar
    Join Date
    May 2007
    Posts
    248
    Quote Originally Posted by Cold Fusion
    Where I live theres a allot of after glow in the sky; in fact, its to such an extent that I actually have to draw my curtains in. (And the array of Hollywood/ party spot lights doesn't help)

    I need the go to the eastern Californian desert I guess; and bring a good camera.
    Desert's a good idea as there's not only little light (most of the time) but also the low humidity helps when you wanna stare up in disbelief and think: WHOOA, thaaath's what 7000 Stars look like!!
    Build a man a fire and he will be warm for a day, set a man on fire and he will be warm for the rest of his life.
    Reply With Quote  
     

  11. #10  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,168
    Quote Originally Posted by Cat1981(England)
    The amount of stars that suddenly appear is truly inspiring, one of those things everybody should be before they die.
    Sorry Cat, but I'm drunk, jet lagged and in KL. You cannot say the amount of stars. you should say the number of stars. Number refers to discrete quantities, amount refers to continuous quantities. e.g. There were a large number of posters on line that evening versus Most of the posters showed a limited amount of intelligence.
    This confusion between continuous and discrete quantities is one of my personal bug bears.
    Reply With Quote  
     

  12. #11  
    M
    M is offline
    Forum Junior
    Join Date
    Sep 2006
    Posts
    282
    Cold Fusion, is the fact that you haven't seen any stars in pictures taken from the space shuttle really so surprising?

    Have you ever tried taking a decent picture of the full moon (from Earth)? How many stars do you see in that picture? Even simpler: Focus your bare eyes on the full moon, and then try to make out any stars in your peripheral vision (without directly looking at them!). How many do you count? I haven't tried that, but I'd be surprised to see a lot of stars. Human eyes don't have an infinite dynamic range, either. They're just very good at fooling us, by immediate adjustments of aperture and focus.

    I suppose an astronaut could take a picture of stars if he wanted to, but think about it: If you were up there what kind of pictures would you take? Certainly not the ones you could just as well take from Earth.
    Reply With Quote  
     

  13. #12  
    Forum Ph.D. Cat1981(England)'s Avatar
    Join Date
    Sep 2006
    Location
    South Downs.
    Posts
    913
    Quote Originally Posted by Ophiolite
    Sorry Cat, but I'm drunk, jet lagged and in KL. You cannot say the amount of stars. you should say the number of stars. Number refers to discrete quantities, amount refers to continuous quantities. e.g. There were a large number of posters on line that evening versus Most of the posters showed a limited amount of intelligence.
    This confusion between continuous and discrete quantities is one of my personal bug bears.
    One more thing learnt. I have also noticed that i have written "be" rather then 'do'. :?
    Eat Dolphin, save the Tuna!!!!
    Reply With Quote  
     

  14. #13  
    Forum Bachelors Degree Demen Tolden's Avatar
    Join Date
    Sep 2007
    Location
    St. Paul, Minnesota, USA
    Posts
    475
    I visit the Hubble web site every once in a while when I want to ponder the amazing forces of the universe. It has some amazing pictures.

    http://hubblesite.org/gallery/

    But truely, everyone should experience the humbling site of thousands of stars, northern lights, and shooting stars that you experience in a northern camping trip far far away from any city. I took a trip this last summer with some amateur musician friends, and wasn't even thinking much about the sky-canvas until it seemed to appear suddenly during our music session. Fire, music, stars... great combonation.
    The most important thing I have learned about the internet is that it needs lot more kindness and patience.
    Reply With Quote  
     

  15. #14  
    Forum Professor
    Join Date
    Apr 2007
    Location
    In the circuitous haze of my mind
    Posts
    1,028
    Those are amazing pictures....but it just makes we want to go there; which I think is possible, but will take another 100 years for us to discover how to do so.
    Of all the wonders in the universe, none is likely more fascinating and complicated than human nature.

    "Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."

    "Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence"

    -Einstein

    http://boinc.berkeley.edu/download.php

    Use your computing strength for science!
    Reply With Quote  
     

  16. #15  
    Forum Isotope (In)Sanity's Avatar
    Join Date
    Oct 2004
    Location
    Mesa AZ
    Posts
    2,699
    Couple of pictures I took in my back yard in my very light polluted down town Phoenix. I've moved since.



    Pleased to meet you. Hope you guess my name
    Reply With Quote  
     

  17. #16  
    Administrator KALSTER's Avatar
    Join Date
    Sep 2007
    Location
    South Africa
    Posts
    8,231
    Wow, that's cool. What are those? Magellanic Clouds or Andromeda?

    Edit: Oh sorry, I'm not sure you can see the Magellanic Clouds from the northern hemisphere.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
    Reply With Quote  
     

  18. #17  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,168
    You can see them from the Northern Hemisphere, but not all that far North. I am pretty sure I used to see them from Malaysia. Anyway they are amorphous, so its not them. And Andromeda is more edge on than face on. This looks like Messier 51, but that's just dredged up from some subconscious memory.
    Reply With Quote  
     

  19. #18  
    Forum Isotope (In)Sanity's Avatar
    Join Date
    Oct 2004
    Location
    Mesa AZ
    Posts
    2,699
    Quote Originally Posted by KALSTER
    Wow, that's cool. What are those? Magellanic Clouds or Andromeda?

    Edit: Oh sorry, I'm not sure you can see the Magellanic Clouds from the northern hemisphere.
    Galaxy M51
    Pleased to meet you. Hope you guess my name
    Reply With Quote  
     

  20. #19  
    Universal Mind John Galt's Avatar
    Join Date
    Jul 2005
    Posts
    14,168
    Quote Originally Posted by Ophiolite
    This looks like Messier 51, but that's just dredged up from some subconscious memory.
    Quote Originally Posted by (In)Sanity
    Galaxy M51
    When I'm hot, I'm hot. 8)
    Reply With Quote  
     

  21. #20  
    Forum Professor
    Join Date
    Apr 2007
    Location
    In the circuitous haze of my mind
    Posts
    1,028
    How do you set something up to take pictures like that? What does it cost? (I know, probably tens of thousands)

    Those are awesome pics, I didn't even know that you could see things like that from earth.

    Apparently your light pollution was much less than mine. I can (on a good night) only see about 4 stars, maybe the "big dipper" if I'm lucky.
    Of all the wonders in the universe, none is likely more fascinating and complicated than human nature.

    "Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."

    "Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence"

    -Einstein

    http://boinc.berkeley.edu/download.php

    Use your computing strength for science!
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •