stars and galaxies

Nolan and Eric

A giant luminous ball of plasma held together by gravity.

The first stage of a star is a nebula. A nebula is where stars forms in a dusty

molecular clouds.

The next life stage of a star is a Proto star.

A Proto star is the birth of a star.

The next stage of a star life stage is main sequence star or a massive star.

A main sequence star is our typical sun. A massive star is a star that is made out

of heavier gas A massive star is about 50,000K A regular star is around a few K. K stands for Kelvin, a measurement of

heat that starts at Absolute zero.

After about 1-10billion years a main sequence star will turn into a red giant.

And a massive star will turn into a red supergiant.

They turn into these stars because they expand when they exhaust their hydrogen and change to helium.

When a star dies a red giant will turn into a planetary nebula

And a red supergiant will turn in a supernova which will explode.

After the stars die the planetary nebula will turn into a white dwarf.

After a supernova explosion the star will either become a neutron star or if the supernova collapse it will become a black hole.

Then after a white dwarf there is a black dwarf which is a dead sun.

1.The star gets smaller or bigger in size 2. Nuclear fusion will turn the hydrogen

turns into helium It will expand to become a red super

giant depending on what star it is.

At every center of a galaxy there is a super massive mass black hole.

There is a spiral galaxies There is an elliptical There is an irregular And there are morphologies

Spiral Galaxies consists of rotating disk of stars.

They look like spirals. They usually have a bright

bulge at the center.

The Milky way galaxy>>>

They have an elliptical shape. There are a cluster of suns and planets

that makes up the elliptical shape. M87 is below

They do not have a regular shape like the elliptical and spiral galaxies.

Irregular galaxies were once spiral or elliptical galaxies but were deformed by gravitational action.

Morphologies galaxies have unusual formation

The difference between apparent magnitude and absolute magnitude is that apparent magnitude is a what a star looks from earth and how bright it is and absolute is how bright a star really is.

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http://en.wikipedia.org/wiki/Apparent_magnitude Eric B. http://en.wikipedia.org/wiki/Galaxy abyss.uoregon.edu/~js/ast122/lectures/lec25.html http://cas.sdss.org/dr6/en/proj/basic/galaxies/spirals.asp http://www.daviddarling.info/encyclopedia/E/ellipgal.html http://anneminard.com/wp/wp-content/uploads/2009/04/irregular-

300x300.jpg http://en.wikipedia.org/wiki/Galaxy#Other_morphologies http://answers.yahoo.com/question/index?

qid=20090103163817AAbd4nk