What does the E7 designation signify in Elliptical Galaxy morphology classification?
Answer
A significantly flattened or cigar-shaped appearance when viewed from Earth
Elliptical galaxies are morphologically classified using the 'E' designation followed by a number from 0 to 7, which relates directly to the galaxy's apparent flattening or elongation as seen projected onto the sky. The E0 class represents the least flattened shape, appearing nearly round. As the numerical value increases, the degree of observed flattening increases correspondingly. Therefore, an E7 classification denotes the most highly elongated or flattened shape observed among this galaxy type, often described as cigar-shaped, contrasting sharply with the near-spherical E0 systems.
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