Hubble sequence [SEP] named after
Hubble sequence
The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1926. It is often known colloquially as the Hubble tuning fork diagram because of the shape in which it is traditionally represented. In June 2019, however, citizen scientists through Galaxy Zoo reported that the usual Hubble classification, particularly concerning spiral galaxies, may not be supported, and may need updating. 
Hubble's scheme divided regular galaxies into three broad classes – ellipticals, lenticulars and spirals – based on their visual appearance (originally
Hubble's law and the discovery of the expanding Universe were his greatest achievements. His classification scheme for galaxies, the Hubble sequence, is still the standard and often called the "Hubble tuning-fork". Hubble also discovered the minor planet 1373 Cincinnati, his only asteroid discovery. The lunar crater "Hubble" is also named after him. The approved naming citation was published by the Minor Planet Center on 20 December 1983 ().
External links.
- Lightcurve plot of 2069 Hubble, Palmer Divide Observatory