What+happens+as+a+star+ages?

The question we sometimes wonder is,"What happens when a star ages?" well it is pretty interesting and i will explain it to you. Helium is a gas that is the second most common in the world under hydrogen and is lighter than air but it has no smell or colour. Hydrogen is a gas that is part of water and can be used to make oxygen.It is important for stars and it helps fuel them.

A star is a sphere of gas mostly hydrogen and helium that is pulled together by gravity. Astronomers believe that stars were born in a cloud of gas. There are different types of stars like a Red Dwarf, Yellow Star, Blue Giant Star, Giant Star, Super Giant Star. A Red Dwarf Stars are smaller than our sun and can go on for trillions of years before they run out of hydrogen it is red because it burns a little amount of fuel so it isn't as hot as much then our star. You can find out how hot it is by it's color, red is the coolest part while yellow is hotter and blue is the hottest. You don't see Red Dwarfs in space because it is very dim. A Yellow Star is like our Sun they have more heat then a Red Dwarf because of there color. A Blue Giant are large and really hot so it burns their hydrogen much faster. A Giant Star is as you know a star that is really huge so it takes a lot of space. And a Super Giant Star is the same thing as a Giant Star.

When a star like ours get old it starts to run out of hydrogen and then the core gets all stuck together. After it will burn a new fuel it is called helium it burns hotter than hydrogen the extra heat makes the star expand making the star much larger than it used to be. There are different Dwarfs one of them is a Black Dwarf it is called that because it was originally a White Dwarf but it cooled down and doesn't give of light anymore. A Red Dwarf is a star that does everything slower than a normal star it burns it's hydrogen slower. Normal stars die when they use up their hydrogen in their core but for a Red Dwarf they mix it up and won't die until they use all of it up. A Red Dwarf are smaller than a normal star.

Our sun is about one solar mass and as it ages it gets bigger until it becomes a red giant then it starts to die and form a planetary nebula it has nothing to do with planets though, after a while it starts to shrink most of the layers of the planetary nebula will fade and the remains is a pretty ring. You can only see the ring for only 50,000 years if you can live that long. Then finally it will turn in to a White Dwarf. There are different endings for a Star one is that if it is a high solar mass star it will turn in to a Super Giant Star and supernova. After a supernova you get a neutron star another ending is that the burned out core of the sun has no energy to fuse with like hydrogen and helium and then covered by it's own gravity it will turn into a black hole.

And now you know what happens to a star when it gets older, to sum it all up a star gets old and then it either explode and make a neutron star and a black hole or it could turn in to planetary nebula and make a White Dwarf.



Images from Google images.

Bibliography

[] http://www.astrophysicsspectator.com/topics/stars/ http://www.universetoday.com/24219/what-is-a-neutron-s http://www.kidsastronomy.com/stars.htm http://www.astronomytoday.com/cosmology/evol.html http://science.nationalgeographic.com/science/space/universe/supernovae-article/ http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/971002b.html