how many galaxies in existence?
445928
How many grains of Sand are there in the whole world?
556954
there are nine planets in the solar system. it is not know yet how many planets are there in the entire universe, because we just know about 3 galaxies (and still do not know about any planets in galaxies other than the milky way)
563730
Galaxies are clusters of stars and its planetary systems found in groups across the universe. List of Galaxies can be found in link below. \n\nThey are really far... measured in light years and the distance is increasing as per our expanding universe.
179092
Speaking in strictly statistical terms, it is inevitable that at any given moment in the life of the universe as a whole there are at least 10 MILLION planets in this galaxy alone which are capable of supporting life.\nIt is statistically a sure bet that at least 10 of these planets are supporting intelligent life.\nStatistics cannot give a clue, however, about what these fellow sapient beings look like or think like.
604824
The astrobiology folks at NASA have calculated that there are between one and thirty billion habitable planets in our Milky Way Galaxy.  If our solar system is typical,  you can multiply that by about 10 to get total planets: between 10 and 300 billion.  \n\nSo where is everybody?
820280
There are about 2800 stars that can be seen with the naked eye, if the conditions are ideal (no light pollution, super dark night with clear sky, and assuming you can only see part of the sky as a big part is on the other side of the planet) see link #1.\nHowever, if you want to know how many are there that could be visible if you had the most powerful telescope anyone can imagine, then the number is a bit more: 70 sextillion (see link #2).\nOur galaxy, the Milkyway, contains about 100 billion stars, and there are more galaxies in the universe than there are stars in a galaxy.
644281
we really don't know how many stars are in the sky. new ones are found every day and others blow up. so i guess the number in infinite.\n\nas for the black hole, somewhere in our galaxy and in other places too.
37854
Estimates are between 10^22 to 10^24 for the universe.\nhttp://www.esa.int/esaSC/SEM75BS1VED_extreme_0.html\nFrom the site in the source -\nLike the number of grains of sand on the beach or angels that can dance on the head of a pin, the number of stars in the sky remains a great unknown. Discussing the number of stars in the Milky Way alone, astronomer William Keel, writing for the sci.astro Galaxies FAQ, claims that there are "about as many as the number of hamburgers sold by McDonald's."\n\nThen he elaborates. The usual way to determine the number of stars in the universe is to consider how many stars there are in the Milky Way, and then to multiply that number by our best guesstimate at the number of galaxies in the universe. This FAQ suggests there are probably about 400 billion stars in the Milky Way, although "a 50% error either way is quite plausible." As for the number of galaxies in the universe, well that's a whole separate mathematical puzzle.\n\nOther star enumerators we located on the Web offer numbers ranging from more than 200 billion stars in our galaxy to 3 thousand million billion stars (3 followed by 16 zeroes), in the universe. NASA alleges there are zillions of uncountable stars.\n\nFrom a recent astronomy news article on CNN.com, we learned about the Sloan Digital Sky Survey, an ambitious astronomy project currently mapping the night sky, to determine the "positions and absolute brightnesses of more than 100 million celestial objects."\n\nSo stay tuned, the star count is still out.
604002
There are so many galaxies, that 2 are a small finding. Maybe those two had something special, making the news on the radio.
821714
Galaxies come in a variety of shapes.  Ours is a spiral, but only about 25% of galaxies are spirals.  There are also barred spirals (about 20%), which tend to be a bit smaller than normal spirals.  There are ellipticals (about 50%), a category with the widest range of sizes, from the dwarf ellipticals that accompany the Andromeda spiral to giants with up to a trillion stars.  These, although classed as ellipticals, are usually spherical in shape.  There are also irregular galaxies, and rare ones like Seyferts and ringtails.\nAs to why, the best we can say at the moment is that this is the consequence of their evolution and gravitational interaction with other galaxies, including collisions and mergers.
642903
As many, as there are stars in the universe.
1005881
There are _trillions_ of stars in the Universe.  Our galaxy, the Milky Way, is composed of 300 - 400 billion stars.  There are _billions_ of galaxies in the Universe, many dwarfing the size of ours.\n\nThe chance of other life _not_ being out there is so close to zero that it can't even be calculated.  There are infinite possibilities in this Universe, and we haven't begun to study more than a tiny bit of them.\n\nTo anybody that has the audacity to say "no" there isn't, then get an ego check.  We aren't the only intelligent life in a Universe of infinite possibilities.
21164
4 In recent centuries astronomers who scanned the heavens with early telescopes noticed some fuzzy, cloudlike formations. They assumed that these were nearby clouds of gases. But in the 1920’s, as larger, more powerful telescopes came into use, these “gases” were found to be something far more immense and significant: galaxies.\n\n5 A galaxy is a vast group of stars, gas and other material rotating around a central nucleus. Galaxies have been called island universes, for each one of them is in itself like a universe. For example, consider the galaxy we live in, which is called the Milky Way. Our solar system, that is the sun and the earth and other planets with their moons, is part of this galaxy. But it is only a very tiny part, for our Milky Way galaxy contains over 100 billion stars! Some scientists estimate at least 200 to 400 billion. And one science editor even stated: “There could be as many as five to ten trillion stars in the Milky Way galaxy.”2\n\n6 The diameter of our galaxy spans so vast a distance that if you could travel as fast as the speed of light (186,282 miles a second) it would take you 100,000 years to cross it! How many miles is that? Well, since light travels about six trillion (6,000,000,000,000) miles in a year, multiply that by 100,000 and you have the answer: our Milky Way galaxy is about 600 quadrillion (600,000,000,000,000,000) miles in diameter! The average distance between stars within the galaxy is said to be about six light-years, or about 36 trillion miles.\n\n7 It is almost impossible for the human mind to comprehend such size and distance. And yet, our galaxy is just the beginning of what is in outer space! There is something even more staggering. It is this: So many galaxies have now been detected that it has been said they “are as common as blades of grass in a meadow.”3 About ten billion galaxies are in the observable universe! But there are many more beyond the range of today’s telescopes. Some astronomers estimate that there are 100 billion galaxies in the universe! And each galaxy may contain hundreds of billions of stars! I don't think there's an end in sight.
588202
The total number of known stars is 10,000,000,000,000,000,000,000, when we write this number out. This figure would be pronounced as "ten billion trillion" stars.\n\nAs technology improves, this number will continue to increase since there are many more stars out there.
35874
In our Solar System, there are eight official planets, nine if you count Pluto (whose status is being debated).  \n\nAs for the rest of the universe, it is difficult to say, but it is reasonable to assume that planet formation from leftover stellar material is relatively common.  Astronomers usually detect large gaseous planets (like Jupiter) by the slight wobble of the star's motion due to the gravity of the planet, so currently it is almost impossible to detect small planets.\n\nAs of November 2005, there were 164 confirmed extrasolar planets.
39505
That's a tough answer for even astronomers to estimate accurately. I've studied astronmy for 30+ years and it seems that the most common answer is between 200 to 400 billion. What's kind of funny about that is it seems to be really rare to read an article that says there are about 300 billion stars in the Milky Way. I have no idea why that is- strange huh? It is more common to read the number 200 billion though. Remember nobody actually counts them unless a computer does it. It's just an estimate based on a number of different obsevations. There is a lot of our galaxy that can't be seen because of interstellar dust and gas. We can't even see the center of the Milky Way from here with our eyes. We can only look towards the center which is in the constellation of Sagittarius.\nWe can see the center and other obscurred areas using different wavelenths of light that the human eye can't see, but it's still hard to pin down a close number with accuracy.
606528
200 billion stars in the Milky Way.