[DOC] [TLE] CLASSIFICATION [PAR] Apr 18, 2000 ... Two of these three types are further divided and classified into a ... Elliptical 
galaxies are shaped like a spheriod, or elongated sphere. ... Spiral galaxies have 
three main components: a bulge, disk, and halo (see right). ... The halo contains 
old clusters of stars, known as globular clusters. ... Irregular Galaxies... [DOC] [TLE] Characteristics of Galaxy Classes - SkyServer - SDSS [PAR] In fact, elliptical galaxies contain primarily old, red stars (also known as 
Population II stars). Elliptical ... The disk of the galaxy contains the spiral arms. 
The disk is... [DOC] [TLE] Coma Cluster of Galaxies | astroEDU [PAR] Astronomers classify galaxies based on their appearance into three main classes
: elliptical, spiral, and irregular galaxies. ... Elliptical (E), Lenticular (S0), Barred 
Lenticular (SB0), Spiral (S), Barred Spiral (SB) and Irregular (IR). ... When 
astronomer Edwin Hubble first started studying these various types of galaxies in 
the... [DOC] [TLE] The Hubble Tuning Fork - Classification of Galaxies | ESA/Hubble [PAR] The most important difference between these two groups is the bar of stars ... An "
SBc" is thus a loosely wound barred spiral galaxy. "S0," or lenticular galaxies, are 
in the transition zones between ellipticals and spirals and bridge these two types. 
... large elliptical galaxies residing in the centers of some clusters of galaxies. [DOC] [TLE] Elliptical galaxy - Wikipedia [PAR] An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape 
and a smooth, nearly featureless brightness profile. Unlike flat spiral galaxies 
with organization and structure, they are more ... Most elliptical galaxies are 
composed of older, low-mass stars, with a sparse .... Astronomy Picture of the 
Day. NASA. [DOC] [TLE] Lenticular galaxy - Wikipedia [PAR] A lenticular galaxy is a type of galaxy intermediate between an elliptical and a 
spiral galaxy in galaxy morphological classification schemes. ... As a result, they 
consist mainly of aging stars (like elliptical galaxies). .... globular clusters are 
found more frequently in lenticular galaxies than in spiral galaxies of ..... Irregular 
galaxy. [DOC] [TLE] Classifying Galaxies - Teach Astronomy [PAR] Our Milky Way is a barred-spiral galaxy with a disk of arms that connect to a bar, 
a bulge, ... more loosely wound arms have much more prominent luminous stars, 
star clusters, ... These are classified as S0 galaxies and are sometimes called 
lenticular ... astronomers consider them intermediate between spirals and 
ellipticals. [DOC] [TLE] Coma Cluster Student Activity Sheet - Full Color [PAR] ated a classification scheme in which he ... out to be wrong, although 
astronomers still use these ... Spiral (S): Flat disk shape with notable spiral 
patterns in ... Irregular (IR): An oddly shaped galaxy ... Star. There are too many 
pos sibilities, so do not count these. II. Star) .... Elliptical and lenticular galaxies (E
, S0, and SB0). [DOC] [TLE] Galaxy - Dictionary definition of Galaxy | Encyclopedia.com: FREE ... [PAR] Astronomers generally classify galaxies according to their shape as either spiral, 
... Until the 1920s, there was a controversy: Were these spiral nebulae part of the 
... the distance to the galaxy or cluster of stars containing the Cepheid variable. ... 
However, irregular and elliptical galaxies tend to be smaller and fainter on the... [DOC] [TLE] Introductory Astronomy on the Internet, Topic 2 in Lesson 14 [PAR] Astronomers classify galaxies into three major categories. ... Compared with 
spiral galaxies, elliptical galaxies contain very little cool gas and ... Galaxies that 
appear neither disklike nor rounded are classified as irregular galaxies. ... These 
are called lenticular galaxies because they look lens-shaped when seen edge-
on. [DOC] [TLE] Other Galaxies - University of Northern Iowa [PAR] How do astronomers distinguish galaxies from other fuzzy objects? ... With long 
exposures on film, various features such as spiral structure and star clusters are 
visible. ... But when you go to a telescope and look out in the sky and you see 
these .....

Question: Astronomers classify these clusters of stars as elliptical, lenticular, irregular or spiral
Answer: galaxies