I believe everyone of us afraid the day when the world is end. Every single life on earth are all depend on the energy from sun, without sun, none of us can be survived and the food-chain will be completely destroy, neither the beautiful plants, wild animals, the gorgeous creatures underneath the sea, nor human.
While the earth is giving alert signal on global warming, the atmosphere layer is getting thinner, the icebergs on Antarctic and Arctic are start melting due to the climate change which causes the sea water level are rising. As we all know, 2/3 of the world are covered by water and ice, if the global warming is continued to deteriorate, the world will be submerged and all the living creatures will be drowned to death. It made me remember of my favourite movie, Artificial Intelligence, where many years later, what's left are only a “water-world” with no single life remains.
Take some time to think and knowing how the galaxy of stars and the Sun were formed, and how human are destroying the world and how all the planet will be disappeared. No more shinning stars we could see, no more air we could breath and no more chances to enjoy the day by the beaches under a red hot sun.
It reminds me, do not take the earth and the sun for granted. Well, I will keep it in mind, always.
Now listening to this song by James Blunt - One of the brightest star. Hope you will love it and just like how we should love our earth and to all the stars.
One day your story will be told
One of the lucky ones whos made his name
One day they'll make you glorious
Beneath the lights of your deserved fame
And it all comes 'round once in a lifetime
like it always does.
Everybody loves you 'cause you've taken a chance
out on a dance to the moon
To soon
And they'll say told you so, we were the ones who saw you first of all
we always knew that you were one of the brightest stars
One day they'll tell you that you've changed
Though they're the ones that seem to stop and stare
One day you'll hope to make the grave,
before the papers choose to send you there
And it all comes 'round once in a lifetime
like it always does.
nobody loves you 'cause you've taken a chance
out on a dance to the moon To soon
And they'll say told you so, we were the ones who saw you first of all
we always knew you that you were one of the brightest stars
And they'll say told you so, we were the ones who saw you first of all
we always knew you that you were one of the brightest stars
The Birth Of The Sun
The Sun, like other stars, was formed in a nebula, an interstellar cloud of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies (like our galaxy, the Milky Way).
In the stellar nursery, dense parts of the clouds undergo gravitational collapse and compress to form a rotating gas globule.
The globule is cooled by emitting radio waves and infrared radiation. It is compressed by gravitational forces and also by shock waves of pressure from supernova or the hot gas released from nearby bright stars. These forces cause the roughly-spherical globule to collapse and rotate. The process of collapse takes from between 10,000 to 1,000,000 years.
As the collapse proceeds, the temperature and pressure within the globule increases, as the atoms are in closer proximity. Also, the globule rotates faster and faster. This spinning action causes an increase in centrifugal forces (a radial force on spinning objects) that causes the globule to have a central core and a surrounding flattened disk of dust (called a protoplanetary disk or accretion disk). The central core becomes the star; the protoplanetary disk may eventually coalesce into orbiting planets, asteroids, etc.
The contracting cloud heats up due to friction and forms a glowing protostar; this stage lasts for roughly 50 million years. If there is enough material in the protostar, the gravitational collapse and the heating continue.When a temperature of about 27,000,000°F is reached, nuclear fusion begins at the core of the Sun. This is the nuclear reaction in which hydrogen atoms are converted to helium atoms plus energy. This energy (radiation) production prevents further contraction of the Sun.
Young stars often emit jets of intense radiation that heat the surrounding matter to the point at which it glows brightly. These narrowly-focused jets can be trillions of miles long and can travel at 500,000 miles per hour. These jets may be focused by the star's magnetic field.
Later, the Sun stabilizes and becomes a yellow dwarf, a main sequence star which will remain in this state for about 10 billion years. After that, the hydrogen fuel is depleted and the Sun begins to die.
THE DEATH OF THE SUN
The Sun is about 4.5 billion years old. it has used up about half of its nuclear fuel (hydrogen). In about 5 billion years from now, the sun will begin to die.
As the Sun grows old, it will expand. As the core runs out of hydrogen and then helium, the core will contact and the outer layers will expand, cool, and become less bright. It will become a red giant star.
After this phase, the outer layers of the Sun will continue to expand. As this happens, the core will contract; the helium atoms in the core will fuse together, forming carbon atoms and releasing energy. The core will then be stable since the carbon atoms are not further compressible.
The Pistol nebula: a planetary nebula in Sagittarius.
The Egg nebula: a planetary nebula that formed a few hundred years ago. Then the outer layers of the Sun drift off into space, forming a planetary nebula (a planetary nebula has nothing to do with planets), exposing the core.
Most of its mass will go to the nebula. The remaining Sun will cool and shrink; it will eventually be only a few thousand miles in diameter!
Images and partial information courtesy from http://www.enchantedlearning.com/subjects/astronomy/sun
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