By; Rachel

Life Cycle of Stars!

How stars are formed. 1;

All stars form from cloud of gas (nebulae).

Stars that have more mass than 6 solar masses are expected to supernova!

Stars that have less mass than that turn into white dwarfs.

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html

A nebula is and interstellar cloud of dust.

Nebula was originally a general name referring to any extended astronomical object

http://en.wikipedia.org/wiki/Nebula

The Eagle Nebula!

clounaghscience.wordpress.com/

SupernovaSupernova A A supernovasupernova is when is when a very big star a very big star EXPLODES. EXPLODES. This This happens when a star happens when a star runs completely out of runs completely out of energy to produce energy to produce heat and light.heat and light.

The biggest The biggest supernovassupernovas are are hyper giants. The hyper giants. The smallest smallest supernovassupernovas are supergiants.are supergiants.

http://simple.wikipedia.org/wiki/Supernovahttp://simple.wikipedia.org/wiki/Supernova

A supernova!

www.lawlibrary.co.za/.../2007/issue_16.htm

White Dwarf

A white dwarf is a star formed mostly of electron-degenerate matter.

A white dwarfs mass is comparable to that of our sun’s.

White dwarfs!

Science.nationalgepgraphic.com/science/photos/white-

dwarfs-gallery.html

http://en.wikipedia.org/wiki/White_dwarf

How stars are formed. 2;

Following a supernova, if the remaining part has a mass more than 3 solar massed, it turns into a black hole.

When they are burning hydrogen into helium, stars are their smallest. This occurs during the majority of their life.

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html

BlackBlack HoleHole

A black hole is a figure in the universe that has such a mighty pull of gravity that even light can’t get away.

Many astronomers didn’t know of its existence until recently. http://simple.wikipedia.org/wikli/Black_hole

A black hole!

wopat.uchicago.edu/

Hydrogen FusionHydrogen Fusion Hydrogen fusionHydrogen fusion is a is a

cycle where four cycle where four hydrogen nuclei form hydrogen nuclei form together to make a together to make a helium nucleus.helium nucleus.

Electrons, protons, Electrons, protons, and neutrons are and neutrons are involved in the course involved in the course of hydrogen turning of hydrogen turning into helium.into helium.

http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Nuclear_Reactions/Fusion/Fusion_in_stars/H_fusion.html

Hydrogen fusion process!

outreach.atnf.csiro.au/…/stars_types.html

Helium FusionHelium Fusion

Helium fusion is a kind of nuclear fusion.

http://en.wikipedia.org/wiki/helium_fusion

science.howstuffworks.com/energy-form-space.htm

How stars are formed. 3;

While stars are burning hydrogen into helium, they are sometimes called “dwarfs.”

There are white dwarfs, and brown dwarfs.

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html

BrownBrown DwarfDwarf Brown DwarfBrown Dwarf is an expression for an is an expression for an

object in space object in space

that is bigger and different that is bigger and different

than planets, than planets,

but its not a but its not a

true startrue star. .

http://simple.wikipedia.org/wiki/Brown_dwarfhttp://simple.wikipedia.org/wiki/Brown_dwarf

news.nationalgeographic.com/news/2006/03/0323_060323_brown_dwarf.html

Why low-mass and high-Why low-mass and high-mass stars take different mass stars take different

paths.paths. Low-mass stars and high-mass stars take Low-mass stars and high-mass stars take

different paths at the end of their lives different paths at the end of their lives because high-mass stars become so because high-mass stars become so compact that they have to do something compact that they have to do something different than low-mass stars.different than low-mass stars.

http://wiki.answers.com/Q/Why_low-mass_high-mass_stars_take_different_paths_at_the_end_of_their_lifehttp://wiki.answers.com/Q/Why_low-mass_high-mass_stars_take_different_paths_at_the_end_of_their_life

VOCABULARY FOR STARS!VOCABULARY FOR STARS!otherother

ProtostarProtostar

A protostar is a large object that forms by decrease out of gas a giant molecular cloud in the interstellar medium.

The protostellar phase is an early stage in star formation

http://en.wikipedia.org/wiki/Protostar

A protostar!

Physics.ship.edu/~mrc/pfs/108/node3.htm

Main Sequence Star

A main sequence star is a continuous and extraordinary chain of stars that appear on the plots of stellar color versus brightness.

http://en.wikipedia.org/wiki/Main_sequence_star

Mai

n se

quen

ce s

tar!

www.sciencecodex.com/surface_details_of_altair

Red GiantRed Giant

A A red giantred giant is a very big is a very big star that weighs about star that weighs about one half to ten times as one half to ten times as much as our sun.much as our sun.

They are called They are called red red giantsgiants because they look because they look red and are very big.red and are very big.

Many Many red giantsred giants could could fit thousands and fit thousands and thousands of suns, like thousands of suns, like the one in our solar the one in our solar system, inside them!system, inside them!

http://simple.wikipedia.org/wiki/Red_gianthttp://simple.wikipedia.org/wiki/Red_giant

www.skyofplenty.com/?page_id=374

Planetary NebulaPlanetary Nebula A A planetary nebula planetary nebula is is

a nebula made up of a nebula made up of gas and plasma.gas and plasma.

Planetary nebulaePlanetary nebulae are called this because are called this because if you look at them if you look at them through optical through optical telescopes, they look telescopes, they look like planets.like planets.

They are made of They are made of particular stars when particular stars when they die.they die.

http://simple.wikipedia.org.wiki/Planetary_nebulahttp://simple.wikipedia.org.wiki/Planetary_nebula

Commons.wikimedia.org/wiki/File:Planetary.Nebula.Formation.png

A planetary nebula!

Neutron StarNeutron Star Neutron stars Neutron stars are very are very

small and dense stars small and dense stars that hare made almost that hare made almost entirely out of neutrons.entirely out of neutrons.

A A neutron starneutron star is a is a large nucleus held large nucleus held together by gravity.together by gravity.

A A neutron star’sneutron star’s radius radius is about 10 kilometers is about 10 kilometers and its mass is about and its mass is about 1.4 to 5 times the sun’s 1.4 to 5 times the sun’s mass.mass.

http://simple.wikipedia.org/wiki/Neutron_starhttp://simple.wikipedia.org/wiki/Neutron_star

Commons.wikimedia.org/wiki/File:Neutron_star_cross_section.jpeg

Supergiant

A supergiant is a larger star than our sun.

It has a short life span of 10-50 million years because or its large mass

They can be red (which are cold) or blue (which are hot).

http://www.faq.com/qa/qa_10705.html cse.ssl.berkeley.edu/…/cycle/supergiant.html

Red supergiant!

Black DwarfBlack dwarf is when a white dwarf becomes too cool to create large amounts of heat and light.

Although, black dwarfs are not proved to exist because it takes a white dwarf longer than the current age of the universe to turn into one.

http://simple.wikipedia.org/wiki/Black_hole

Theyorf.blogspot.com/2007/08/

lives-of-stars.html

A dead black dwarf star!