morphological classification
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Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence, devised by Edwin Hubble and later expanded by Gérard de Vaucouleurs and Allan Sandage. However, galaxy classification and morphology are now largely done using computational methods and physical morphology.
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When only one pair of opposite sides of a quadrilateral is parallel then the quadrilateral is called----.
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When only one pair of opposite sides of a quadrilateral is parallel then the quadrilateral is called----.
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