Hi ! My name is Kiera

Dodd and I am doing a power-point on stars

STARS !

Stars

• Stars are cosmic energy engines that produce heat, light, ultraviolet rays, x-rays, and other forms of radiation. They are composed largely of gas and plasma, a superheated state of matter composed of subatomic particles.

No one knows how many stars exist, but the number would be staggering. Our universe likely contains more than 100 billion galaxies, and each of those galaxies may have more than 100 billion stars.

Stars

• Some stars have always stood out from the rest. Their brightness is a factor of how much energy they put out, which is called their luminosity, and also how far away from Earth they are

• Stars in the heavens may also appear to be different colors because their temperatures are not all the same. Hot stars are white or blue, whereas cooler stars appear to have orange or red hues

• Stars may occur in many sizes, which are classified in a range from dwarfs to supergiants. Supergiants may have radii a thousand times larger than that of our own sun.

• Masterfile is one of the main supergiants still alive

• Young stars at this stage are called protostars. As they develop they accumulate mass from the clouds around them and grow into what are known as main sequence stars. Main sequence stars like our own sun exist in a state of nuclear fusion during which they will emit energy for billions of years by converting hydrogen to helium.

• Stars evolve over billions of years. When their main sequence phase ends they pass through other states of existence according to their size and other characteristics. The larger a star's mass, the shorter its lifespan will be.

• As stars move toward the end of their lives much of their hydrogen has been converted to helium. Helium sinks to the star's core and raises the star's temperature—causing its outer shell to expand. These large, swelling stars are known as red giants.

• Young stars at this stage are called protostars. As they develop they accumulate mass from the clouds around them and grow into what are known as main sequence stars. Main sequence stars like our own sun exist in a state of nuclear fusion during which they will emit energy for billions of years by converting hydrogen to helium.

• The red giant phase is actually a prelude to a star shedding its outer layers and becoming a small, dense body called a white dwarf. White dwarfs cool for billions of years, until they eventually go dark and produce no energy. At this point, which scientists have yet to observe, such stars become known as black dwarfs.

• A few stars eschew this evolutionary path and instead go out with a bang—detonating as supernovae. These violent explosions leave behind a small core that may become a neutron star or even, if the remnant is large enough, a black hole.

• Stars evolve over billions of years. When their main sequence phase ends they pass through other states of existence according to their size and other characteristics. The larger a star's mass, the shorter its lifespan will be.

• As stars move toward the end of their lives much of their hydrogen has been converted to helium. Helium sinks to the star's core and raises the star's temperature—causing its outer shell to expand. These large, swelling stars are known as red giants.

Brightest starsCommon Name Scientific Name Distance (light years) Apparent Magnitude Absolute Magnitude Spectral Type

Sun - -26.72 4.8 G2VSirius Alpha CMa 8.6 -1.46 1.4 A1VmCanopus Alpha Car 74 -0.72 -2.5 A9IIRigil Kentaurus Alpha Cen 4.3 -0.27 4.4 G2V + K1VArcturus Alpha Boo 34 -0.04 0.2 K1.5IIIpVega Alpha Lyr 25 0.03 0.6 A0VaCapella Alpha Aur 41 0.08 0.4 G6III + G2IIIRigel Beta Ori ~1400 0.12 -8.1 B81aeProcyon Alpha CMi 11.4 0.38 2.6 F5IV-VAchernar Alpha Eri 69 0.46 -1.3 B3VnpBetelgeuse Alpha Ori ~1400 0.50 (var.) -7.2 M2IabHadar Beta Cen 320 0.61 (var.) -4.4 B1IIIAcrux Alpha Cru 510 0.76 -4.6 B0.5Iv + B1VnAltair Alpha Aql 16 0.77 2.3 A7VnAldebaran Alpha Tau 60 0.85 (var.) -0.3 K5IIIAntares Alpha Sco ~520 0.96 (var.) -5.2 M1.5IabSpica Alpha Vir 220 0.98 (var.) -3.2 B1VPollux Beta Gem 40 1.14 0.7 K0IIIbFomalhaut Alpha PsA 22 1.16 2.0 A3VaBecrux Beta Cru 460 1.25 (var.) -4.7 B0.5IIIDeneb Alpha Cyg 1500 1.25 -7.2 A2IaRegulus Alpha Leo 69 1.35 -0.3 B7VnAdhara Epsilon CMa 570 1.50 -4.8 B2IICastor Alpha Gem 49 1.57 0.5 A1V + A2VGacrux Gamma Cru 120 1.63 (var.) -1.2 M3.5IIIShaula Lambda Sco 330 1.63 (var.) -3.5 B1.5IV

1 and 2 !• Question 1 Question 2What are stars made up of?. What is the brightest

stars A.) heat, light name?• B.) light, ultraviolet rays A.) Sun D.) none

ofc.)x-rays B.)Sirus theseD.) all of above C.)spica

3 and 4 !Question3What is the final step in a star before it dies?.A.) super GiantB.)dwarfc.)black holeD.) milky wayQuestion 4Why are some stars brighter then some other stars.?A.) luminosityB.)Gravityc.) because they have ate a lotD.)brightonosity

• Question 5and 6What stars all the coolest?.A.)dwarfB.) Super GiantsHow long does it take for stars to evoleA.) billions of yrs.B.) trillions of yrsC.) trillions of yrsD.)3.5 billion yrs.

• Questions 7and 8When stars get closer to when they start to die out there oxygen

converts into.?A.)HeliumB.)carbon DioxideC.)gasD.)air

What is the main Super Giant still alive?.A.)MasterfileB.)SirusC.)VegaD.) none of these

• Question 9 and 10What are stars mainly composed of?.A)plasma, gasesB.)energy, heliumC.) light, gravityD.) All of aboveCooler stars are more likely to be ?.A.) reddish, orangeB.) blue, greenC.)yellow, bluesD.)black, white

SHOOTING FOR THE TOP NOT THE BOTTOM

SO VOTE FOR STARS BECAUSE WE LIGHT UP YOUR WORLD LIKE NOBODY ELSE ! OHHOHHH WE ALL NO YOUR BEAUTIFUL ! ;)

Thanks hoped you enjoyed it !

• DON’T 4 GET VOTE FOR STARS AND WE WILL RAISE THE BAR!

Work sited

• masterfile.com

astropirate.blogspot.com

herschel.cf.ac.uk

ir.isas.jaxa.jp

science.nationalgeographic.com/science/space/universe/stars-article

www.astro.wisc.edu/~dolan/constellations

http://onlyhdwallpapers.com/space/green-clouds-outer-space-stars-planets-desktop-hd-wallpaper-171783/http://www.123rf.com/photo_6499223_sparkly-muliticolor-vibrant-star-bokehs-on-beautiful-background-with-big-star-in-the-middle-good-for.html

theinaguas.com

footage.shutterstock.com

istockphoto.com