Evolutio2 - Evolution Within a billion years of a galaxy's...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Evolution Within a billion years of a galaxy's formation, key structures begin to appear. Globular clusters , the central supermassive black hole, and a galactic bulge of metal-poor Population II stars form. The creation of a supermassive black hole appears to play a key role in actively regulating the growth of galaxies by limiting the total amount of additional matter added. [88] During this early epoch, galaxies undergo a major burst of star formation. [89] During the following two billion years, the accumulated matter settles into a galactic disc . [90] A galaxy will continue to absorb infalling material from high-velocity clouds and dwarf galaxies throughout its life. [91] This matter is mostly hydrogen and helium. The cycle of stellar birth and death slowly increases the abundance of heavy elements, eventually allowing the formation of planets . [92] The evolution of galaxies can be significantly affected by interactions and collisions. Mergers of galaxies were common during the early epoch, and the majority of galaxies were peculiar in
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

Ask a homework question - tutors are online