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Stars...

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by

Grace Malone

on 17 April 2014

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Transcript of Stars...

Life cycle
Young stars at this stage are called protostars. As they develop they grow from clouds around them and grow into what are known as main sequence stars.
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.
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
Apperance
Stars are balls of gas that produce heat, light, x-rays, and other forms of radiation. They are composed largely of gas and plasma, a superheated state of matter.
No one knows how many stars exist, but the number would be large. Our universe likely contains more than 100 billion galaxies, and each of those galaxies may have more than 100 billion stars. Yet on a clear, dark night Earth's sky reveals only about
Appearance (pt.2)
3,000 stars.Some stars have always stood out from the rest. Their brightness of how much energy they put out, which is called their luminosity, and also how far away from Earth they are.
Stars may also appear to be different colors because their temperatures are not all the same.
Color and degrees
Hot stars are white or blue, where as cooler stars appear to be orange or red.
Stars may occur in many sizes, which are classified in a range from Supergiants may be thousand times larger than that of our own sun. Hydrogen makes stars grow. As they get smaller, the clouds spin faster.
Building pressures cause rising temperatures inside such a nascent star, and nuclear fusion begins when a developing young star's core temperature climbs to about 27 million degrees Fahrenheit (15 million degrees Celsius).
All About Stars
By: Chantrea, Grace, Alice, And Ally

Life cycle (pt. 2)
When star dies its knon to be in its White Dwarf stage. When that stage is over it explodes into whats called a supernova. Supernova is the final stage of the star. The supernova either becomes a neutron star or a black hole it depends on the stars destiny.
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