> [BTW, is it "Milky Way" or "Milky-Way" ?]
"Milky Way". According to the web search I did, the "Way" in "Milky Way" means "road" -- something I didn't realize until now. Like that Roman road named the Appian Way, it wouldn't have a hyphen.
What is the width of a spiral arm?
After eyeballing this picture of a spiral galaxy from above:
http://www.astro.psu.edu/users/stark/ASTRO11/lab11-12images/spiral-face/aat017.jpg
...If the Milky Way is about 100,000 ly across, then I'd say they're in the neighborhood of 10,000 ly wide. ______________________________________________________________________ Steve Sloan ......... Huntsville, Alabama =========> [EMAIL PROTECTED] Brin-L list pages .............................. http://www.brin-l.org Chmeee's 3D Objects .................... http://www.sloan3d.com/chmeee 3D and Drawing Galleries .................. http://www.sloansteady.com Software ................ Science Fiction, Science, and Computer Links Science fiction scans ......................... http://www.sloan3d.com
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