STARS

By Luca L’EveilleBy Luca L’Eveille

IntroductionIntroduction

Stars are balls of gas mainly hydrogen and Stars are balls of gas mainly hydrogen and helium. Many stars are made up of the helium. Many stars are made up of the same elements on Earth even though they same elements on Earth even though they are different size, temperature and age. are different size, temperature and age.

Stars are born out of clouds of gas and dust. As the star reaches middle age it shines steadily, powered by the hydrogen in the centre of the star. All stars no matter what size all run out of hydrogen and begin to die.

Small stars live up to 200 billion years, medium stars live up to 10 billion years and large 10 million years. Our sun is medium sized, and has 5 billion years left to live.

Birth and age

Largest starsLargest stars

In order to know the largest star In order to know the largest star astronomers would have to go through all astronomers would have to go through all the stars in the universe. Astronomers the stars in the universe. Astronomers have not come close to that. The largest have not come close to that. The largest star known is the star known is the pistol starpistol star. There are . There are over 100 billion stars in our galaxy, and over 100 billion stars in our galaxy, and about as many galaxy's in the observable about as many galaxy's in the observable universe. universe.

The SunThe Sun

We could not live without the Sun, It We could not live without the Sun, It provides us warmth, if we didn’t have the provides us warmth, if we didn’t have the sun on Earth it we would be -237sun on Earth it we would be -237CC. The . The Sun provides us energy for plants, food, Sun provides us energy for plants, food, light at day and night and gravity for earths light at day and night and gravity for earths orbit.orbit.

Without the sun earth wouldn’t exist since Without the sun earth wouldn’t exist since the earth is formed from the same the earth is formed from the same materials. materials.

SupernovasSupernovas

Within the remain of a super nova is a collapsed Within the remain of a super nova is a collapsed core named a core named a neutron starneutron star it it has the mass as he mass as our sun although much smaller.our sun although much smaller.

Some Neutron stars rotate rapidly and are called Some Neutron stars rotate rapidly and are called quasars.quasars.

Stars Stars The brightest stars in the sky aren't really The brightest stars in the sky aren't really

stars but planets, Jupiter, Venus and stars but planets, Jupiter, Venus and Mars.Mars.

About 2000 stars can be seen in the night About 2000 stars can be seen in the night sky.sky.

Stars twinkle because of the shimmering Stars twinkle because of the shimmering of heat in the earth Atmostsphere.of heat in the earth Atmostsphere.

Some stars are trillions of kilometre away Some stars are trillions of kilometre away and there light take thousands of years to and there light take thousands of years to reach us reach us

Bibliography Bibliography

http://curious.astro.cornell.edu/question.php?number=377

http://nfo.edu/astro/sun.htm http://www.giantstars.de/ http://en.wikipedia.org/wiki/Star http://ask.yahoo.com/20020312.htm http://imagine.gsfc.nasa.gov/docs/science/know_l1/super

novae.html http://answers.yahoo.com/question/index?qid

=20090203203735AAGxO9m

Thank you for watching my slide show about stars I hope you enjoyed it.