why sun never disappear?
104921
because the earth are moving around the sun so thats y..its never disappear.
801281
to all people who have answered before me, please read.\n\nMecury may transit the sun, but it is still invisible to the naked eye.  If you reflet the sun's image through a hole in a pirce of paper, you still won't see it.  Mercury is tiny and only special wavelength photographs will show a tiny speck.  With the sun's brightness, the naked eye cannot see it.\n\nVenus transits the sun very rarely if ever.  the last transit was last year.  It probably won't transit the sun for a very lnog time.\n\nIf you saw something, it might have been something closer to home... like a sattilite orbiting earth or a helicopter..
189981
The sun does attract the earth quite a bit. That's what keeps the earth orbiting it instead of flying off into space.
334251
The sun is not a planet.
75655
I suppose in time it will die out.  Our sun is nothing more than a star and they do fade. As for whether or not it gets smaller or not but it will fade, get cooler, and less bright.  I would think that meant getting smaller too but I am not sure.
751960
No because the sun always shines
1148911
This happens every day... The sun is always visible to us on Earth.  Only durring a solar eclipse is the sun not visible to us.  And the stars are always there but you can't see them with the sun becuase the sun out shines the ohter stars.
908149
SUN SOLARIS.\n\nI can not answer the reason - sorry.
214368
I'm going to focus on the word "producing" here.  The sun produces heat and light through thermonuclear reactions in its core.  If those reactions were to stop tomorrow, it would take hundreds of thousands of years for us to find out.  Maybe scientists who study the sun would know sooner.  Energy that is produced in the core has to collide with an immense number of particles on its way to the surface -- so many particles that it takes about one million years for this light to make it to the surface.\n\nEven if the reactions that power the sun stopped tomorrow, it would go on shining for roughly a million years.  No one in our lifetime, or for many generations to come, would be the wiser.
17267
It is an optical illusion.  The sun is the same size all the time.  When it is at the horizon, you have many things to compare it to.  When it is in the middle of the sky, there is just sky....
44971
There are many reasons.\nHere are a couple:\n\nThe temperature,\nThe matter that the sun is comprised of\nCheck out http://science.howstuffworks.com/sun.htm
718907
As time goes on and the sun ages the power output of the sun (or Luminosity to use the technical term) is increasing.  The sun is now about 25% more powerful than it was when it was formed and in about a billion years will be putting out too much power for Earth to be inhabitable (unless we do something like move the Earth away from the sun).\n\nOn short scales most of the changes over the 11 year solar cycle is in the EUV and X-ray parts of the spectrum which are only a minor part of the sun's output (which peaks in the yellow) and are blocked by the upper atmosphere (which does get a lot hotter during solar maximum because of the higher incidence of EUV and X-rays).\n\nA 1% power reduction probably wouldn't do much, the Oceans of the Earth make a very good heatsink and make it very hard to change the temperature of the Earth (they are probably hiding a great deal of the effects of global warming from us).\n\nThe Sun is one of the more stable stars out there although no star is completely stable.
280642
It is a coincidence.\n\nThe sun is much larger than the moon (~400 times), and yet the moon is much closer than the sun (~400 times).\nIt is remarkable coincidence that right now, as seen from the Earth, both the moon and the sun appear the same size.\nIt will not stay this way forever, the moon is very slowly moving away from the Earth, eventually it will get far enough away that it will look smaller than the sun and there will be no such thing as a total solar eclipse.
71906
The sun does not produce sound waves.  This is because sound needs a medium to travel in, and there are no media in space.
1092600
Not only possible, but it's happinging right now.  The sun converts millions of tons of hydrogen per second into helium and energy.  Mass is lost because the total weight of the helium is less than the original hydrogen to make it.  Thus some mass was converted to pure energy.\n\nSo the sun has been losing mass since it's first nuclear reactions when it became a star about 4.5 billion years ago.\n\nAlso, combined with solar flares and mass coronal injections, there is trillions of tons that the sun has lost over the years.\n\nAs far as the orbit goes, it does affect the orbit (making the earth tend go farther out), but it's negligible.  The sun is soooooo massive that even mind boggling losses in mass in our perspective is only a pittance to the sun's perspective.\n\nJust a side note...\n\nOur earth orbit really goes from nearly a perfect circle to a slight oval every 10,000 years.  Some attribute ice ages being  significantly impacted by this effect, along with global warming, etc.\n\nAlso, guess what.  Just a fun fact, but the earth GAINS about a million or so tons a year from meteorites, solar dust, etc.\n\nEarly in the earth history this Mass gain was MASSIVE.  Most of the oceans were formed by comet impacts.\n\nSo while the sun gets a little lighter, the earth actually gets a little heavier.  Hows that for odd...
619024
sun has huge amt of hydrogen atom which under the high temp. undergo nuclear fussion reaction to produce helium ion with emission of huge amount of light & heat......so becoz of this light it always shine...& bcoz of that heat the nuclear reaction keep to continue......
17497
Sun is burning because of which we are getting energy in the form of sunlight.\nActually is gas where hydrogen in it combines to form helium nuclues this process is called as nuclear fusion. in this process lot of energy is relesead which makes sun burn.\nSo when all the hydrogen in the sun is over U CAN SAY SUN BURNT UP. because then ther is no hydrogen to burn.