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SlideshowReport

Hubble’s Tuning Fork Diagram

Description
Hubble’s Tuning Fork Diagram
Hubble summarized his classification scheme for galaxies with this tuning
fork diagram. Elliptical galaxies are classified by how oval they appear,
whereas spirals and barred spirals are classified by the size of their
central bulges and the correlated winding of their spiral arms. An S0 or
SB0 galaxy, also called a lenticular galaxy, is an intermediate type
between ellipticals and spirals. It has a disk but no spiral arms.
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