Question

Why are spiral galaxies the most commonly observed galaxies?

Answer 1

They are the most commonly observed from Earth, but not necessarily the most common (ellipticals are).

Answer 2

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New research finds that spiral arms are self-perpetuating, persistent, and surprisingly long lived. Spiral galaxies make up roughly 77 percent of the galaxies that scientists have observed. ... Because elliptical galaxies are made up of older, dimmer stars, they are more challenging to spot.