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People have found stars to be fascinating since the beginning of time. When people travelled around the world, they watched the stars in order to be able to [url=http://www.mxitcms.com/abercrombie/]abercrombie[/url] figure out where they were. Scientists that study the stars are known as astronomers, and they spend a lot of time studying stars in order to try to understand them. Stars are made up of plasma, and they are held together by gravity. The sun [url=http://www.sandvikfw.net/shopuk.php]hollister outlet sale[/url] is a star, and it [url=http://www.thehygienerevolution.com/hollister.php]hollister france[/url] is the one that is the closest to the earth. The sun makes it possible for there to be life on earth because of the energy that it provides.
Stars are made because of explosions that happen in outer space. When the gravitational pull becomes unstable within molecular clouds, gas and dust will form due to the splitting up of the original cloud. In the areas of the cloud that have an extremely high density, and this causes the gas and dust to collapse. As the gas and dust [url=http://www.rtnagel.com/louboutin.php]louboutin[/url] collapses, it produces heat and a higher gravitational pull. Eventually, this protostellar cloud will become stable, and this is when a protostar [url=http://www.jeremyparendt.com/Barbour-Paris.php]barbour pas cher soldes[/url] is formed. .
Throughout most of its life, the star will use hydrogen in order to make an energy that emits helium. When a star is first formed, it will increase the amount of helium that it produces on a regular basis. As this happens, you will notice that the star will become brighter as well as becoming hotter. The sun [url=http://www.teatrodeoro.com/hollisterde.php]hollister[/url] was a star that was formed over 4 billion years ago.
When you look at the night sky, you probably do not think about how old the stars that you are seeing are. Typically, these stars have been measured to be anywhere between one to ten billion years old. However, there are some stars that still exist that are as old as the universe. A star's lifespan is dependent on how big it is. Smaller stars have the longest lives, and they can survive over a hundred billion years. However, the larger stars will typically last only a few billion years because they are able to convert hydrogen to [url=http://www.jeremyparendt.com/Hollister-b5.php]hollister[/url] helium faster. This means that they last only a few billion years before they die.
When it comes to the Milky Way galaxy, these are the stars that we are able [url=http://www.thehygienerevolution.com/hollister.php]hollister[/url] to see from earth. The sun is considered to be one of these stars. The stars that are in the Milky Way galaxy are made up of mostly hydrogen with [url=http://www.giuseppezanottipaschere.com]giuseppe zanotti soldes[/url] a smaller amount of helium. However, most of these stars, except for the sun, are so far away that we are unable to feel any of the heat that they emit.
There are many different factors that astronomers take into account when they are measuring the lifespan of a star. Some of the things that they have to look at are the temperatures, how fast they rotate, and their radiation levels.
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