What is the width of a spiral arm?
Joshua replied:
Using http://www.anzwers.org/free/universe/milkyway.html as a reference, roughly 5500 ly
Not only does that page have nice pictures but it's got links to the data to back it up.
How accurate is that map with regards to the naming of the arms? If I'm looking at it correctly, the Norma arm splits out to become the Cygnus and Perseus arms, our own Orion arm vanishes into either the Perseus or Saggitarius arm, and the Scutum-Crux arm splits in two like Norma but the two separate parts don't have separate names. Would all of these be symptoms of what it says farther down the page, "There is very little data available about the far side of the Galaxy..."?
Oh, and hey Joshua, what's up?
Reggie Bautista Milky Map Maru
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