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en.wikipedia.org/wiki/Messier_87

Messier 87 is a supergiant elliptical galaxy in the constellation Virgo. One of the most massive .... That is, about one part in six of the galaxy's mass is in the form of stars that are radiating energy. The total mass of .... 1 and 6 parsecs. The size of the M87 clusters shows a gradual increase with distance from the galactic center.

en.wikipedia.org/wiki/O-type_star

Relative size of O-type stars with other main-sequence stars. An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system .... O- type stars represent the highest masses of stars on the main sequence. ... It has been estimated that there are around 20,000 massive O-type stars in the galaxy.

www.flashcardmachine.com/stellar-astronomy-test4.html

Apr 17, 2012 ... Most of the new star formation in the Milky Way Galaxy is found in the ... The greatest variation in size and mass occurs in which type of galaxy?

www.flashcardmachine.com/stellar-astronomy-finalexam.html

Apr 17, 2012 ... Stellar masses are determined directly by observation of the orbits ..... The greatest variation in size and mass occurs in which type of galaxy?

www.britannica.com/topic/galaxy/Types-of-galaxies

galaxy - Types of galaxies: Almost all current systems of galaxy classification are ... Each of these classes is subclassified into three types according to the size of the .... type Sd. It also has been found that some of the variations noted here for Sc ..... The total mass of material within the radius out to which the stars or gas of a ...

space-facts.com/galaxy-types

It uses the three main types, and then further breaks them down by specific characteristics (openness of spirals, size and extent of bars, size of galactic bulges).

www.space.com/22395-elliptical-galaxies.html

Aug 15, 2013 ... Elliptical galaxies are the most abundant type of galaxies found in the ... the size of the Milky Way and contain only ten million times the mass of ...

www.cliffsnotes.com/study-guides/astronomy/the-milky-way-galaxy/structure-of-the-galaxy

This analysis gives the size of the whole Galaxy as about 30,000 pc diameter ( 100,000 ly). ... Within the interstellar material, denser regions contract to form new stars. ... the halo and disk occurs, but it is also the site of violent and energetic activity. .... If the greatest portion of the mass of the Galaxy were concentrated at its ...

futurism.com/ic-1101-the-largest-galaxy-ever-found

Jan 17, 2016 ... It's located almost a billion light-years away and has a mass of ... Galaxies are grouped into three size variations: dwarf galaxies, ... This type of galaxy is the most commonly observed in the universe, ... The Biggest of the Big.

ned.ipac.caltech.edu/level5/March07/Grebel2/Grebel1.html

In spite of its small size and its small number of galaxies the LG plays a prominent ... While massive early-type galaxies are absent, the LG still provides us with ... of magnitude in galaxy masses, a variety of different morphological types, very ... Within the small volume of the LG, galaxies occur in environments ranging from ...