how many stars do we have in the world?
411104
Trillions upon trillions. More than you can count.
365063
As of April 18th, 2006 we know of 152 planetary systems other than our own containing a total of 176 planets.  This number grows fairly frequently as more and more observations are being made.
1037220
There are definetly more than nine planetes in the solar system.There are many discovered by scientists and many more are yet to be found. And it is suggested that there are many more solar systems in the milky way.
515664
Our galaxy the Milky Way contains about a hundred billion stars, there are billions of galaxies out there. I think man would be presumptious to the extreme if he believed he were the only intelligent life to exist in all of creation. I am sure with all the advances in technology, that within twenty years a signal will be picked up, that unmistakeably answers your question: We Are Not Alone!
267355
estimated 100 billion galaxies containing 100 billion stars each
967583
The other answers regarding star counts are accurate.  In fact, just like people, stars are dying and being born all over the universe.  Therefore an exact count would require omnicient overisght - there is no way a human being could know how many stars exist, are dying, and being born at one time.  \n\nWhile the universe has been thought to be infinite, or finite but really, really big, I like to conisder it finite with infinite ability for expansion.  Of course, based on its current expansion rate, the universe will eventually begin to collapse.
313861
YES. There are many stars in our galaxy with solar system formed.
257126
There are not an infinite number of stars, but there are billions and billions. The universe is not infinte, as we can see close to the end (boundary) of the universe with telescopes like the Hubble. Because there are so many galaxies and clusters where new stars were being born millions of years ago, because the speed of light is also not infinite, no one can really count them.\nhttp://www.cnn.com/2003/TECH/space/07/22/stars.survey/\nFor more, go here:
750080
There are 192 member countries recognized by the United Nations, and 193 recognized by the state department of the U.S. There are currently 9 (the number is disputed) planets if you count Pluto and 8 if you don't, but that is just in our solar system. There are a lot more planets out there.
364385
Stars are not scattered randomly through space, they are gathered together into vast groups known as galaxies. The Sun belongs to a galaxy called the Milky Way. Astronomers estimate there are about 100 thousand million stars in the Milky Way alone. Outside that, there are millions upon millions of other galaxies also!  \n \n  \n \n \n Hipparcos mapped millions of stars in our galaxy, but how many more are there? \nIt has been said that counting the stars in the Universe is like trying to count the number of sand grains on a beach on Earth. We might do that by measuring the surface area of the beach, and determining the average depth of the sand layer. \n\nIf we count the number of grains in a small representative volume of sand, by multiplication we can estimate the number of grains on the whole beach. \n\nFor the Universe, the galaxies are our small representative volumes, and there are something like 1011 to 1012 stars in our galaxy, and there are perhaps something like 1011 or 1012 galaxies. \n\nWith this simple calculation you get something like 1022 to 1024 stars in the Universe. This is only a rough number, as obviously not all galaxies are the same, just like on a beach the depth of sand will not be the same in different places. \n\nNo one would try to count stars individually, instead we measure integrated quantitites like the number and luminosity of galaxies. ESA's infrared space observatory Herschel, to be launched in 2007, will make an important contribution by 'counting' galaxies in the infrared, and measuring their luminosity in this range - something never before attempted.
47202
around 10^22 to 10^24 stars.\n\nsearch for my previous answer.\n\nhttp://www.esa.int/esaSC/SEM75BS1VED_extreme_0.html
28023
The observable universe is estimated to contain:\n10^11 galaxies, 10^21 stars, and 10^78 atoms.\n\nThe means 100,000,000,000 galaxies.
1053678
Well, we're all just one person out of billions of people on this little rock that orbits around the Sun; and the Sun is just one of billions of stars in our galaxy, the Milky Way, which is just one of billions of galaxies in our Universe (of which there may be an infinite amount more).  Makes you feel kinda small, huh.
16225
Worldwide\n8.3 Million\n\nU.S.\n2.5 Million
973173
There are more stars than we can count.  Most of them have planets.   Most of those planets have moons.
705687
One estimate is 156 billion light years wide.\n\nhttp://www.space.com/scienceastronomy/mystery_monday_040524.html
15235
It is estimated that there are approximately 200 million stars in the Milky Way and each one has the potential to have a "solar system" of some type.  Depends on many factors and the type of planets that can exist around a particular star also have many factors.  A number of "solar systems" have been found around other stars.  A current list of them can be found at exoplanets.org