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classification of galaxies and nebulas

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by

David Wright

on 25 September 2013

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Transcript of classification of galaxies and nebulas

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Classification of Galaxies and Nebulas/Universe Structures
*cloud of interstellar gas and dust.
Galaxy
Nebula
*a system of billions of stars, gas, and dust
Solar System
Scale of Universe
Objective:
students should be able to
*compare /contrast 3 types of galaxies
*compare/contrast 5 types of nebulas
*understand universe and galaxy structures
Works Cited
The End!
*not a clearly defined shape ,large amounts of gas and dust, and stars are young
*Elliptical- round, dimmer stretched out circle





Elliptical
*Spiral-twisted collection of stars and dust, made up of hot young stars

Spiral
Irregular
*a bright diffuse nebula that emits light as a result of ionization of its gas atoms by UV radiation
Emission
* reflects the light of neighboring stars.
Reflection
* absorbs and obscures the light from stars behind it, appearing as a dark patch in front of a bright nebula .
Dark
* expanding shell of thin ionized gas that is ejected from and surrounds a hot, dying star of about the same mass as the sun
Planetary
Supernova Remnant

*the gas absorbs UV radiation from the central star and reemits it as visible light by the process of fluorescence.
*structure resulting from the explosion of a star in a supernova.
*the sun, the planets,and everything else revolving around it
http://www.ask.com/
http://dictionary.reference.com/
google images.Web. 25 September 2013.
*universe
*super cluster
*galaxy cluster
*galaxy
*galaxy cluster-hundreds to thousands of galaxies

*super cluster-large groups of smaller galaxy
groups

*voids-empty spaces between galaxy filments
Full transcript