How many constellations are there that are scientifically known of? First How many do you think there are?
491346
Constellations are figments of human imagination.  They are just random stars that appear to have a shape if you look hard enough.
629998
The number of stars in the visible universe is estimated to be 70 sextillion, or 70,000,000,000,000,000,000,000 [seven followed by twenty-two zeros].\n\nor\n\nWikipedia claims that the observable universe contains about 7 × 1022 stars, organized in about 100 billion galaxies, which themselves form clusters and superclusters. An Ask the Scientist response to this question claimed that there are about 10 billion (10^10) stars in an average galaxy, \nand there are about 10 billion galaxies that we can observe in the universe, so the answer is 100 billion billion or 10^20. I don't think it is an issue that we have a precise answer for as yet.
379905
some say 4 some say 2...look at a pic of a spiral galaxy, most have 2...ours has 2 the Orion Arm, in which we live on the near outer end, and the Sagittarian Arm...which got its name because it appears to cross the constellation Sagittarius.
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.
300780
there are several (you did not provide enough details)...could be a sun, galaxy, nebula, etc.
293305
There are 81 stars in the constellation Orion:\n\nStars with apparent magnitude of brighter than 3: 8\nStars visible to the naked eye: 75
661572
Constellations are meaningless light patterns that the ancients invented when looking at the night sky, by thinking it in two dimensions as the internal surface of a gigantic sphere.\nThey are constituted not only by stars (which would be somehow consistent) but by random mixes of celestial objects such as stars, planets, moons, galaxies and galactic conglomerates.\nThe only thing that all these light sources have in common is just that they are approximately in the same direction when seen from Earth and projected in 2D, but they belong to different, unrelated, very far systems when seen in 3D.\nIn modern astronomy, constellations have no other use than a traditional way of speaking to locate celestial objects when pointing the telescope.
1004330
How many stars are in the sky>how many horses in the world>how many teens in the Ukraine. You question can't easily be answered due to the fact that it is too general. Sorry!!!!
1169797
There are about 250,000 angiosperm species (flowering plants and trees), and about 80,000 gymnosperm species.  Include the other groupings, and the total comes to about 370,000.\n\nThat said, it is estimated that we have discovered only between 10 and 40% of all known species (and we probably never will discover them given the rate of destruction of habitats such as rain forests.\n\nSo the total is probably between 1.5 and 3.7 milliion, though it's a moot point because we'll never, ever know!
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.
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
1084800
There are 47 known moons. You can answer you're own question by going here.\nhttp://sci.esa.int/science-e/www/object/index.cfm%3Ffobjectid%3D35229
671223
Like 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." \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.
671170
Are you including the stars that are being created, as well as those that do not actually exist anymore but have died out/ supernova'd/ etc. that we are just still seeing since the light has to travel so far?  \n\nI would be interested in how you determined this number ^_^
705687
One estimate is 156 billion light years wide.\n\nhttp://www.space.com/scienceastronomy/mystery_monday_040524.html
113742
No one can say for certain. Matter of fact we don't know exactly how many stars there are in our own Milky Way Galaxy. Most guestimates for the Milky Way run to about 250-billion stars. Then there are about 250-billion other galaxies in the observable universe, each with more or less 250-billion stars each. A reasonable ball park figure for total number of stars in the observable universe would be approximately---approximately!---   5^22. That's 5 followed by 22 zeros.
1028050
Try this website:\n\nhttp://www.starshine.com/frankn/astronomy/constellations.asp