How are Elliptical galaxies classified based on their apparent flatness?
Answer
Denoted by 'E' followed by a number from 0 to 7
Elliptical galaxies are systematically categorized based on their visual degree of elongation, ranging from nearly perfect spheres to highly stretched ovals. This system uses the prefix 'E' followed by a numerical index running from 0 to 7. An E0 designation signifies the most spherical shape possible, lacking significant apparent flattening. Conversely, an E7 galaxy represents the maximum observed elongation or flatness within this morphological class. This numerical system directly reflects the apparent geometry observed when viewing these systems, differentiating them based on how stretched out their featureless structure appears.
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