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    Multi-colored Stars

    I was out observing about an hour ago (finally found M51 for the first time :biggrin:) when I noticed what I assumed was a star to the northeast just a few degrees above the horizon. I looked at it and immediately noticed it appeared to be flashing, but not like an airplane. I stared at it more...
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    Stargazing Lunar Eclipse

    Did anyone else catch the eclipse last night? I drug out the Dob around 9:30 and watched until 11:15 or so. It was brutally cold but totally cloudless and clear for most of the night. Saturn was right there too, at opposition I believe; so I got some good views of it too. I took a bunch of...
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    Zhumell 3x Barlow

    Sorry to be starting a new topic yet again, hope I don't look like a post whore: I'm thinking about buying this barlow but first I have some questions. 1) Will I be sacrificing a lot of image quality (if any) in using a 3x barlow? My scope is a 12" Dob. 2) Will the barlow simply triple...
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    Could I Have Seen the Horsehead?

    The other night I was outside observing with my telescope (12" Zhumell Dob) and I saw Mars, the Pleiades, several random constellations and some bright blue planet/star. I also found a small light blue 'smudge' though, and after about five minutes it still hadn't moved and appeared to have four...
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    Collimation Problems

    I have a 12" Zhumell Dobsonian and I've been trying all day to collimate it and can't get it lined up right. This is what it looks like when peering into the eyepiece holder: http://img184.imageshack.us/img184/4786/christmasscope008dx6.jpg [Broken] Can anyone tell me if this is a secondary...
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    Gravity as a Function of X

    This isn't a homework question, just one that's been nagging me for a while, and it is algebra so I thought this an appropriate place for it. I've been working on this problem at my whiteboard for a good half hour and can't figure out. I'm sure it's very simple but a search of Google and these...
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    Getting into Physics

    I generally try to avoid posting threads like this but this isn't exactly something one can Google. How, at sixteen and with very little math knowledge, can I get started in astrophysics? I read about physics and have a grasp on some concepts but I don't know anything about the math involved and...
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