When I try to move the div #planet up (I change margin-top from -76px to -86px) my whole site “lifts up”.
You can view the page here (and see the problem) http://rssreaderbg.net/pubsubbub/example/cssexam/index.php
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It’s because a div is a block element, so it stretches from one end to the other. So when you change the top of that particular div, you’re changing the tops of all the following divs.
See the trick (an oldie but a goodie) at the bottom of this page http://css-tricks.com/the-css-box-model/ (as a for instance) to see how this works and to find out how to duplicate it for yourself.