A spiral arm is a large area of ongoing star formation within a spiral galaxy, which makes them appear much brighter and more distinct than other parts of the galaxy.
For example, the milky way contains seven spiral arms, though other galaxies can contain more or less, with a minimum of zero (in the case of spiral galaxies that retain only their central bar) and no real maximum. They contain multiple star systems.
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"Aw, man! Not again, it's a black hole!" - Big Pages Spiral arm is one of the most powerful voids, because it is only 0.00001% matter, and the 'matter' is just letters. Fill in the void by expanding the article. |