life cycle of a star by jackie822 and beanerbutt777
TRANSCRIPT
Life Cycle of A Star
By Jackie822and
Beanerbutt777
The Life Cycle of
Small and Medium Sized Stars
The First Stage: The Nebula
http://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
A n The nebula is a cloud of gas and dust. It is not yet a star.
The Protostarhttp://www.williamsclass.com/EighthScienceWork/ImagesEighth/Protostar.jpg
Brown DwarfA brown dwarf occurs if the protostar is too small to ignite fusion.
http://chandra.harvard.edu/photo/2003/twa5b/twa5b_dwarf_ill.jpg
Main Sequence
http://www.astronomyexpert.co.uk/images/9392.jpg
A protostar gets enough mass to ignite fusion. All main sequence stars fuse hydrogen. Stars spend most of their life in the main sequence stage.
Red Giant
http://home.comcast.net/~van.etten/Support/Red%20Giant.jpg
A red giant is formed when a small to medium sequence star runs out of hydrogen and begins fusing helium.
Planetary Nebula
http://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
A red giant completely stops fusing helium and the outer layers of the star are driven away.
White Dwarf
http://www.nasa.gov/centers/goddard/images/content/207358main_whitedwarf_20080102_HI1.jpg
White Dwarf
The white dwarf is the leftover core of a star. It is extremely dense. It may be the size the earth but has half the weight of the sun.
Black DwarfA white dwarf cools off after trillions of years and eventually stops emitting light.
http://library.thinkquest.org/3103/nonshocked/topics/blackdwarfs/images/blackdwarfimg.gif
The Life Cycle Of
Massive Stars
The NebulaThe Nebula is a cloud of dust and gas.
http://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
Protostarhttp://rigel.csi.cuny.edu/rowan/lectures/Hubble%20Nebulae_files/HelixNebula-HST.jpg
Massive Main Sequence
https://segue.atlas.uiuc.edu/uploads/ryemm2/blue%20main%20sequence.jpg
Massive main sequence stars burn more quickly than small to medium mass main sequence stars because they fuse more hydrogen.
Red Super GiantRed SUPERGIANT
http://solarsystem.nasa.gov/multimedia/gallery/prominence.gif
Red Super giants occur when massive main sequence stars run out of hydrogen and start fusing helium, carbon, oxygen, etc.
SUPERNOVA!
http://d21c.com/sookietex/space_supernova.jpg
When fusion stops, the star collapses and creates a huge explosion.
Neutron Star
http://media.arstechnica.com/journals/science.media/neutron_star.jpg
The super dense core left over after a supernova is called a neutron star.
Black HoleBLACK HOLE
http://startswithabang.com/wp-content/uploads/2008/05/ashtekar_blackhole.jpg
Stars with masses 25-50 times the mass of the sun form a black hole after the supernova. Other stars turn into Neutron Stars. Nobody knows what happens to things after they go into a black hole.
Fin.The End.