Stars

By: Katherine&Kayla

Small and Medium Stars

Nebula Protostar Brow Dwarf Main sequence Hydrogen fusion Red Giant Planetary nebula White Dwarf Black Dwarf

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A nebula is a cloud of gas and dust. A nebula turns into a protostar after an additional amount of gas and dust contract to the original nebula. There are four different kinds of nebulae: diffuse, planertary, protoplanetary, supernova remnants.

Image from: http://s244.photobucket.com/albums/gg26/soxsbabe101/?action=view&current=CatsEyeNebula.jpg

Nebula

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A protostar is a large object that’s forms from the gas of a large molecular cloud in the interstellar medium. A interstellar medium is the dust and gas spread around interstellar space. A protostar will turn in to a main sequence star once it gains enough mass, the temperature rises, and hydrogen starts to fuse. A low mass protostar is smaller than a high mass protostar.

Image found at: http://media.photobucket.com/image/protostar/azharmafia/Digitalblasphemy%20Series/Protostar.jpg?o=3

Brown Dwarf

A brown dwarf is a wanna’ be star but it doesn't get hot enough it be one. There are different types of brown dwarfs. There is spectral class L, spectral T, and spectral Y.

Image found at:http://news.nationalgeographic.com/news/2006/03/images/060323_brown_dwarf_big.jpg

Main SequenceA main sequence is the majority of a stars life. The Sun, Sirius and Alpha Centauri A and B are all main sequence stars. The main sequence happens in the center of a star.

http://aspire.cosmic-ray.org/labs/star_life/starlife_sequence.html

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It happens in main sequence stars. It’s where hydrogen doubles into helium. It releases a lot of energy when this happens.

http://en.wikipedia.org/wiki/File:Deuterium-tritium_fusion.svg

RED

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NT A red giant is a large star weighs about one-half to ten times as much as the sun.

Red giant stars are actually red. Some of the main red stars are Mira , Arcturus and Gamma Crucis .

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Helium FusionHelium fusion

happens when the star runs out of hydrogen so it starts fusing helium. Helium turns in to carbon. It needs to be a lot more hotter for it to work. The star runs out of helium faster than hydrogen. IMAGE FROM: http://en.wikipedia.org/wiki/File:Helium_atom_QM.svg

Planetary NebulaA planetary nebula is a nebula that is made up of gas and plasma. Planetary nebula is made up of certain stars when they die. Planetary stars don't last for long, compared to a star, which only lives for tens of thousands of years.

http://simple.wikipedia.org/wiki/File:Ngc2392.jpg

White dwarf A white dwarf is a star.

The color of a white dwarf is the same as any other regular star, but just not as bright. A star like the sun will become a white dwarf once it has ran out of fuel. Most white dwarf stars are the same size as Earth, and 100 times smaller than the sun.

http://en.wikipedia.org/wiki/File:Sirius_A_and_B_Hubble_photo.jpg

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A black dwarf happens when a white dwarf cools off so much that it has so heat or light. Black dwarfs are a hypothesis, and may not be true. This is the end of the small/medium stars life.

http://en.wikipedia.org/wiki/File:Color_icon_black.svg

BIG STARS

Red SupergiantSupernovaNeutron StarBlack Hole

Red Supergiant Red supergiants are

supergiant stars spectral type K or M. They are the largest type of star, in volume. they are not the largest type in mass. this phase it actually short. some starts may turn in to a blue supergiant, but most turn into a supernova!

Image from: http://cse.ssl.berkeley.edu/bmendez/ay10/2000/cycle/massive.html

Supernova A supernova is when a

star explodes. this happiness when a start total runs out of heat and light. after they cause a burst if light that covers a whole galaxy. after this happens it may turn into a black hole or a neutron star. supernova's are very rare. the last one happened in 1604.

Image from: http://en.wikipedia.org/wiki/File:Crab_Nebula.jpg

Neutron Star

A neutron star is a star that is almost made up of completely neutrons. It's very small a dense. They are just the leftovers of a massive star. They rotate very fast. They come in different types. There is Pulsar, and Low Mass X-ray Binaries.

http://simple.wikipedia.org/wiki/File:Neutron_star_cross_section.jpg

Black Hole

a black hole is a whole with very strong gravity. light can't even escape it. scientist didn't even know that they excised until recently.

http://simple.wikipedia.org/wiki/File:Black_Hole_Milkyway.jpg

Sources!

http://en.wikipedia.org/wiki/Nebula http://www.google.com/search?hl=en&safe=active&defl=en&q=define:Pr

otostar&ei=B-G8SsD6KY_QM__pmc8K&sa=X&oi=glossary_definition&ct=title

http://en.wikipedia.org/wiki/Interstellar_medium http://en.wikipedia.org/wiki/Interstellar_(disambiguation) http://en.wikipedia.org/wiki/Brown_dwarf http://aspire.cosmic-ray.org/labs/star_life/starlife_sequence.html http://simple.wikipedia.org/wiki/Planetary_nebula http://simple.wikipedia.org/wiki/White_dwarf http://en.wikipedia.org/wiki/Red_supergiant http://simple.wikipedia.org/wiki/Supernova http://simple.wikipedia.org/wiki/Neutron_star http://en.wikipedia.org/wiki/Black_hole