Why do the spiral arms of a galaxy appear bright blue?
Answer
The presence of hot, young stars
Spiral arms are areas of high activity where star formation is actively occurring. These regions contain plentiful gas and dust, which act as the raw material for creating new stars. These newly formed stars are typically massive and extremely hot, causing them to shine with a bright blue light, which gives the spiral arms their distinct coloration.
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Types of Galaxies in Space - Spiral, Elliptical, Irregular plus more
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