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Atlantis and Hubble (viewed from earth)

  1. May 15, 2009 #1

    robphy

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    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 15, 2009 #2

    mgb_phys

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  4. May 15, 2009 #3

    Astronuc

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    :cool:
     
  5. May 15, 2009 #4
    How are these pictures taken? The sun isn't that big when viewed from the earth...? If you're focusing on the sun wouldn't the shuttle look huge? can someone explain this?
     
  6. May 15, 2009 #5
    Dear god, they are heading RIGHT FOR THE SUN!!
     
  7. May 15, 2009 #6

    RonL

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    Well! don't just set there, grab the wheel.:rofl:
     
  8. May 15, 2009 #7

    robphy

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    Did you follow the link in my post?
    It says
     
  9. May 15, 2009 #8

    russ_watters

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    robphy, the question was about magnification, not brightness.
    With a normal telescope, the Space Shuttle looks tiny - it is at an altitude of more than 500 km when servicing the hubble. Consider how an airplane looks at an altitude of 10 km - recognizable as an airplane, but only barely. The shuttle is only a few arcseconds across at that altitude, while the sun is 30 arcminutes (1800 arcseconds) across. Yes, the sun really does appear that much bigger than the space shuttle in orbit.
     
  10. May 15, 2009 #9

    Astronuc

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    The Shuttle and Hubble Space Telescope are at an altitude of approximately 350 miles (563 km), and the sun is about 93 million miles (149 million km) from the earth, and the sun has a diameter of 870,000 miles (1.4 million km). The Shuttle orbiter is only 122 ft (37 m) nose to tail.

    http://www.space.com/missionlaunches/090515-sts125-sts125-solar-transit.html
     
  11. May 15, 2009 #10

    mgb_phys

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    https://www.youtube.com/watch?v=98hO97ky-sA
     
  12. May 15, 2009 #11

    drizzle

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    that pop up a question, you know the different photos of the galaxies like the milky way filled with billions of stars, are they real photos? If so how can such photos be taken, isn’t our solar system part of the milky way :confused:
     
  13. May 15, 2009 #12
    Great post!
     
  14. May 15, 2009 #13
    I'd love to see that one.
     
  15. May 15, 2009 #14

    russ_watters

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    Confused is right! The way you worded that doesn't make any sense in the context of the question. Photos of galaxies like the milky way are not photos of the milky way. There are hundreds of galaxies that are readily accessible to amateur astronomers and millions of them detectable by professionals.
     
  16. May 15, 2009 #15

    mgb_phys

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    Yes

    Whats the problem?
     
  17. May 15, 2009 #16

    russ_watters

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  18. May 15, 2009 #17
  19. May 15, 2009 #18
    More seriously though, is it not possible to reconstruct the image of the Milky Way as seen from outside ? We have enough data.
     
  20. May 15, 2009 #19

    russ_watters

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    Not really, since the disk obscures the disk. But here are some estimations: http://cass.ucsd.edu/public/tutorial/MW.html
    From the site:
     
  21. May 15, 2009 #20

    drizzle

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    I see, it's hard to get it. will, like = i.e. = for example, and I know there are hundreds of other galaxies other than the milky way

    the pro is how can this photo be taken?
     
  22. May 15, 2009 #21

    mgb_phys

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    There are lots of other galaxies (about 1011 in the observable universe)
    The milky way is a fairly typical spiral galaxy, there are a lot of nearby spiral galaxies.
    We can see out of our own galaxy fairly easily unless we look toward the centre, because the stars are a long way apart.
    If you look toward the centre of the galaxy you see a lot more stars as in this photo http://www.astropix.com/HTML/D_SUM_S/MILKYWAY.HTM
    It's a bit like being in the suburbs of a city, if you look towar downtown you see a lot of lights but if you look outward you see less.

    We can't take a picture of the whole of our own galaxy but we can work out it's shape by counting the number of stars in each direction around us and then working out what it would look like from outside ( it's the same sort of calcuation you do for a CAT scan)
     
  23. May 15, 2009 #22

    drizzle

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    great, so those pictures of the milky way are not REAL photos, right?
     
  24. May 15, 2009 #23

    mgb_phys

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    Ok I understand your question now!
    The picture of the centre of the galaxy in the above link is genuine, photos of other spiral galaxies are real but photos of the whole of our galaxy aren't
     
  25. May 15, 2009 #24

    Integral

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    What pictures of the Milky Way? Link please?

    Yes, if it claims to be the Milky Way it is an "artists conception".
     
  26. May 15, 2009 #25

    drizzle

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    See the links posted earlier in this thread by russ_watters
     
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