Hi ! My name is Kiera Dodd and I am doing a power-point on stars

1. Stars ! Hi ! My name is Kiera Dodd and I am doing a power-point on stars

2. 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.

3. 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

4. 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

5. 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.

6. 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.

7. 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.

8. Brightest stars

9. 1 and 2 ! • Question 1 Question 2 What are stars made up of?. What is the brightest stars A.) heat, light name? • B.) light, ultraviolet rays A.) Sun D.) none of c.)x-rays B.)Sirus these D.) all of above C.)spica

10. 3 and 4 ! Question3 What is the final step in a star before it dies?. A.) super Giant B.)dwarf c.)black hole D.) milky way Question 4 Why are some stars brighter then some other stars.? A.) luminosity B.)Gravity c.) because they have ate a lot D.)brightonosity

11. Question 5and 6 What stars all the coolest?. A.)dwarf B.) Super Giants How long does it take for stars to evole A.) billions of yrs. B.) trillions of yrs C.) trillions of yrs D.)3.5 billion yrs.

12. Questions 7and 8 When stars get closer to when they start to die out there oxygen converts into.? A.)Helium B.)carbon Dioxide C.)gas D.)air What is the main Super Giant still alive?. A.)Masterfile B.)Sirus C.)Vega D.) none of these

13. Question 9 and 10 What are stars mainly composed of?. A)plasma, gases B.)energy, helium C.) light, gravity D.) All of above Cooler stars are more likely to be ?. A.) reddish, orange B.) blue, green C.)yellow, blues D.)black, white

14. 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 ! ;)

16. Thanks hoped you enjoyed it !  • DON’T 4 GET VOTE FOR STARS AND WE WILL RAISE THE BAR!

17. Work sited • masterfile.com herschel.cf.ac.uk footage.shutterstock.com astropirate.blogspot.com www.astro.wisc.edu/~dolan/constellations ir.isas.jaxa.jp istockphoto.com science.nationalgeographic.com/science/space/universe/stars-article http://onlyhdwallpapers.com/space/green-clouds-outer-space-stars-planets-desktop-hd-wallpaper-171783/ theinaguas.com http://www.123rf.com/photo_6499223_sparkly-muliticolor-vibrant-star-bokehs-on-beautiful-background-with-big-star-in-the-middle-good-for.html