Tag: Spiral

ScienceDaily (Feb. 6, 2010) Galaxy morphology, or the study of the shapes and formation of galaxies, is a critical and much-debated topic in astronomy. An important tool for this is the Hubble sequence or Hubble tuning-fork diagram [1], a classification scheme invented in 1926 by the same Edwin Hubble in whose honour the space telescope is named.

A team of European astronomers led by Franחois Hammer of the Observatoire de Paris has, for the first time, completed a demographic census of galaxy types at two different points in the Universe's history -- in effect, creating two Hubble sequences -- that help explain how galaxies form. In this survey, researchers sampled 116 local galaxies and 148 distant galaxies.