Advertise on Bikeforums.net



User Tag List

Results 1 to 20 of 20
  1. #1
    Super Moderator Allen's Avatar
    Join Date
    Sep 2005
    Location
    Atomic batteries to power; turbines to speed
    My Bikes
    Salsa La Raza, Panasonic Electric, Bria, Bamboo touring, Bamboo cargo
    Posts
    4,677
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Real Question--Astronomy

    I was reading about the hexagon circling Saturn's north pole (which may be the oddest weather feature on any planet in the solar system) and it came to me that I have no idea how wind speed is determined on a gaseous planet. On the Earth, wind speed is measured relative to the solid ground. What is the relative marker used on a planet that has no solid surface?

    For that matter how is the rotational period for the gas giants determined, given that the upper atmosphere (which is the part visible to us) may outpace, or even travel in the opposite direction of the core of the planet?
    Quote Originally Posted by unterhausen
    I believe that in this case "solid meh" means "so 'meh' that it could never be anything more than 'meh', and yet also no less than 'meh' -- in a word, exactly 'meh'"

  2. #2
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AllenG View Post
    I was reading about the hexagon circling Saturn's north pole (which may be the oddest weather feature on any planet in the solar system) and it came to me that I have no idea how wind speed is determined on a gaseous planet. On the Earth, wind speed is measured relative to the solid ground. What is the relative marker used on a planet that has no solid surface?

    For that matter how is the rotational period for the gas giants determined, given that the upper atmosphere (which is the part visible to us) may outpace, or even travel in the opposite direction of the core of the planet?
    When a planet rotates, it wobbles slightly, especially if it has moons. The wobble is very detectable and that's how they measure the rotational period. Knowing that, they can figure the delta between moving gases and the planets overall rotation.

    The density of the planet would have to be absolutely and perfectly uniform for it not to wobble. (see? I didn't split my infinitive)
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  3. #3
    Super Moderator Allen's Avatar
    Join Date
    Sep 2005
    Location
    Atomic batteries to power; turbines to speed
    My Bikes
    Salsa La Raza, Panasonic Electric, Bria, Bamboo touring, Bamboo cargo
    Posts
    4,677
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Thanks. That makes sense.




    Southerners have a genetic deficiency in grammar.
    Quote Originally Posted by unterhausen
    I believe that in this case "solid meh" means "so 'meh' that it could never be anything more than 'meh', and yet also no less than 'meh' -- in a word, exactly 'meh'"

  4. #4
    phony collective progress x136's Avatar
    Join Date
    Sep 2006
    Location
    San Hoosey
    My Bikes
    http://velospace.org/user/36663
    Posts
    2,958
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AllenG View Post
    I was reading about the hexagon circling Saturn's north pole (which may be the oddest weather feature on any planet in the solar system)
    Wow, that's nuts.

  5. #5
    Super Moderator Allen's Avatar
    Join Date
    Sep 2005
    Location
    Atomic batteries to power; turbines to speed
    My Bikes
    Salsa La Raza, Panasonic Electric, Bria, Bamboo touring, Bamboo cargo
    Posts
    4,677
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    The South pole has a giant reverse tornado like storm. Instead of flowing from the base of the funnel up, it goes the other way.

    Cool too, but the hexagon is just weird.
    Quote Originally Posted by unterhausen
    I believe that in this case "solid meh" means "so 'meh' that it could never be anything more than 'meh', and yet also no less than 'meh' -- in a word, exactly 'meh'"

  6. #6
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AllenG View Post
    Southerners have a genetic deficiency in grammar.
    It was a cross-thread inside joke...

    I spent 10 years in Atlanta... luckily I found enough other yankees at school to keep me feeling at home...
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  7. #7
    Super Moderator Allen's Avatar
    Join Date
    Sep 2005
    Location
    Atomic batteries to power; turbines to speed
    My Bikes
    Salsa La Raza, Panasonic Electric, Bria, Bamboo touring, Bamboo cargo
    Posts
    4,677
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Musta have gone to Emory.
    Quote Originally Posted by unterhausen
    I believe that in this case "solid meh" means "so 'meh' that it could never be anything more than 'meh', and yet also no less than 'meh' -- in a word, exactly 'meh'"

  8. #8
    Footballus vita est iamlucky13's Avatar
    Join Date
    Jun 2002
    Location
    Portland, OR
    My Bikes
    Trek 4500, Kona Dawg
    Posts
    2,118
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ehidle View Post
    When a planet rotates, it wobbles slightly, especially if it has moons.
    The problem is in a gaseous planet, that wobble represents a lot of "sloshing" mass rather than an absolute period.

    In Saturn's case, there's several different accounts of the length of a day that vary by about 10 minutes. Some are based on the rotation of the cloud bands, which due to viscosity move approximately at the speed of the bulk of the planet. One that was thought to be pretty solid was a periodic radio wave that emanates from Saturn, but this too was found to vary, as it appears to be caused by the movement of a layer of plasma inside Saturn.

    Still, that margin of error is only about 2-3%

    http://en.wikipedia.org/wiki/Saturn#Orbit_and_rotation
    "The internet is a place where absolutely nothing happens. You need to take advantage of that." ~ Strong Bad

  9. #9
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AllenG View Post
    Musta have gone to Emory.
    Georgia Tech
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  10. #10
    2-Cyl, 1/2 HP @ 90 RPM slvoid's Avatar
    Join Date
    Oct 2003
    Location
    NYC
    My Bikes
    04' Specialized Hardrock Sport, 03' Giant OCR2 (SOLD!), 04' Litespeed Firenze, 04' Giant OCR Touring, 07' Specialized Langster Comp
    Posts
    15,765
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The hexagon shape's been replicated on earth in spinning fluids before. They've gotten a lot of weird shapes in it.

  11. #11
    Banned. ModoVincere's Avatar
    Join Date
    Aug 2006
    Posts
    1,626
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ehidle View Post
    Georgia Tech
    So you sell fries for a living then. Got it.

  12. #12
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ModoVincere View Post
    So you sell fries for a living then. Got it.
    Please... *sigh*
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  13. #13
    Banned. ModoVincere's Avatar
    Join Date
    Aug 2006
    Posts
    1,626
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ehidle View Post
    Please... *sigh*
    oh...you graduated up to the burger flipper?

  14. #14
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ModoVincere View Post
    oh...you graduated up to the burger flipper?
    Don't you understand that stereotype jokes are funny if and only if there is at least some sliver of truth to them?

    Trying to use the burger-flipper joke against a Tech grad is like trying to use poverty jokes against Donald Trump. It just doesn't work.

    Hope this helps.
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  15. #15
    Banned. ModoVincere's Avatar
    Join Date
    Aug 2006
    Posts
    1,626
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ehidle View Post
    Don't you understand that stereotype jokes are funny if and only if there is at least some sliver of truth to them?

    Trying to use the burger-flipper joke against a Tech grad is like trying to use poverty jokes against Donald Trump. It just doesn't work.

    Hope this helps.
    Not a bit...you do understand this is foo.....right? We do very little in a serious manner in here. And for what its worth, I have known several tech grads who flipped burgers for a living. It helped that they owned the franchise, so they were just contributing to their own bottom line, but it fit the stereotype perfectly.

    Hope this helps.

  16. #16
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ModoVincere View Post
    Not a bit...you do understand this is foo.....right? We do very little in a serious manner in here. And for what its worth, I have known several tech grads who flipped burgers for a living. It helped that they owned the franchise, so they were just contributing to their own bottom line, but it fit the stereotype perfectly.

    Hope this helps.
    If they owned the franchise, they were not flipping burgers "for a living." That was not their primary job function. Their primary job function was to act in the capacity as the owner of the business. If it made economic sense for them to assume the duties of a rank and file employee, then that was the decision they made that was in the best interest of their concern.

    The burger-flipping joke is intended to imply a personal lack of intelligence, wealth, or usefulness. It is not meant to be a compliment to someone's success.

    So, it doesn't stand to reason that "it fit the stereotype perfectly."

    btw: "Don't take the ribbing personally." Adverbs are your friend. It is awkward to modify verbs with adjectives.
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  17. #17
    Banned. ModoVincere's Avatar
    Join Date
    Aug 2006
    Posts
    1,626
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Sheesh...are you serious? You come in to foo, a place known not to be the most serious place on the web, and take offense at a stereotype joke about a F'ing school?! WTH is up with that. And then on top of that, you quote a PM (P is for PRIVATE) in your post and try to be an Fing grammar nazi about that as well?
    Congrats, you are the first fooster I will ignore, and I've been here for a while.

  18. #18
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ModoVincere View Post
    Sheesh...are you serious? You come in to foo, a place known not to be the most serious place on the web, and take offense at a stereotype joke about a F'ing school?! WTH is up with that. And then on top of that, you quote a PM (P is for PRIVATE) in your post and try to be an Fing grammar nazi about that as well?
    Congrats, you are the first fooster I will ignore, and I've been here for a while.
    I never took offense to any of it and I still don't. I was simply pointing out the problems in your logic.

    The joke would have been funny had you said something like "So, I guess your computer is your girlfriend," or, "Win any football games lately? (sarcastically)" That's the kind of stuff Tech people are known for, and those would have been really funny, and I might have even laughed.

    I don't mind people making jokes about Tech and Tech people, but they should be at least appropriate, relevant, and funny.

    I'm just trying to help.
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  19. #19
    Videre non videri
    Join Date
    Sep 2004
    Location
    Gothenburg, Sweden
    My Bikes
    1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
    Posts
    3,202
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My guess is that the hexagonal feature is formed by one central (polar) vortex surrounded by six similar vortices, equally spaced. Perhaps they're subpolar and that the circumference at that latitude holds six stable vortices. Fewer, and they become unstable and break up, forming more. More than six, and the excess vortices are ejected to lower latitudes or merged with neighbouring ones. With six stable vortices, the edges will appear somewhat straight, and would also be stable for decades, provided the vortices are large enough.

    Just my off-the-top-of-my-head theory.

  20. #20
    T-Shirt Guy ehidle's Avatar
    Join Date
    Jul 2008
    Location
    Lansdale, PA
    My Bikes
    2005 Fuji Team Issue, 2007 Fuji SL-1
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well, remember, a line on the surface of a sphere that appears straight in in fact not straight at all. So it's perfectly reasonable to postulate that some kind of rotational force is creating them.
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

Posting Permissions

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