How many pulsars had been detected by 1995?
597550
From an article published on April 11, 1997, the amount of pulsars that had been detected went from 4 in 1990, to 35.  Therefore, at an average of about 5 per year, the amount of pulsars found would have been around 25 in 1995.\n\nThe article was published by Joanne Houldsworth for the Center of Radioastronomy and Astrophysics, National University of Mexico (Centro de Radioastronomía y Astrofísica de la Universidad Nacional Autónoma de México).
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.
792835
Yes, the top quark has been seen as well at the LEP collider at CERN in Geneva, in the period 1990-1994. LEP housed four detectors at the time which all detected the top quark.\n\nSee for instance this paper:\nhttp://l3.web.cern.ch/l3/conferences/ps/mg_alviggi_moriond95_paper.ps.gz\n\nI am surprised that Wikipedia says otherwise, because that's plainly wrong!
625689
Pulsar:  \n\n(Astronomy) celestial body which radiates electromagnetic pulses at regular intervals (believed to be a rapidly spinning neutron star)
138258
try these sites: http://www.phy.ornl.gov/astrophysics/data/cf88/\n\nhttp://www.llnl.gov/science_on_lasers/07AstSpace/AS-F_Ther.html\n\nhttp://arxiv.org/abs/astro-ph/9801028\n\nI hope this helps....\n\nDon
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.
251053
There are ~200,000,000,000 stars in our galaxy. There are at least 80,000,000,000 galaxies in the universe, and reasonable estimates are from 80 billion to 400 billion. Estimates of the total number of stars in the universe that I've seen start around 3 followed by 16 zeroes, and a reasonable approximation would be in the neighborhood of 4.8 x 10^22.\n\nNow, we don't know of a single star that is known to NOT have planets; in fact, any planet within an order of magnitude or two of the mass of Earth is far too small for us to even detect, with the exception of those in very unusual systems, such as the one in the link below, which orbits a pulsar (it's also 1/5 the mass of pluto, but even if it were Earth-sized, a pulsar probably wouldn't be very conducive to life forming).\n\nWe also don't know exactly what conditions it takes to form life, how long those conditions need to last, or how long planets normally stay within that range of conditions.\n\nHowever, we can make some estimates.\nThe sun is a G-type star, and, although F-K type stars might be capable of supporting life (and such make up ~64% of the stars in the galaxy), we'll ignore everything but the 18.7% of stars which are G-type.\n\nFurther, let's say that only 1 in 10,000 G-type stars has a planet capable of forming life.\n\nNow, there is, on average, about 1 supernova per galaxy per century, so we'll have to eliminate some candidate stars on that; say about 99% of eligible stars do not form life as a result of radiation bombardment from nearby supernovae.\n\nThen, let's estimate that it takes 100,000,000 years for life to form, and the average planet only has 4,000,000,000 years of its lifespan where life can survive. Then, we have to figure out how many planets have life at any given time. The approximate lifespan of the sun is 10 billion years, so we'll figure that's about average for a G-type star.\n\nWe'll assume that no star has more than one habitable planet, and that no life colonizes any other planets. Then, we'll figure that only 1% of the planets which are still eligible actually have life.\n\nThat still leaves 3-4 planets currently inhabited, in our galaxy alone, including Earth. Multiply that by, oh, say, 1% of the minimum number of galaxies in the universe (just for the fun of it), and we still get nearly 3 billion currently inhabited planets.\n\nSo, I'd say that the answer is a pretty resounding "yes". Although most of them would be extinct long before we could concievably detect their existence, and even if not, they would be extinct for many millenia before we could communicate with them.
952203
they are called Pulsars.
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Right now there are officially 9 planets. Depending on what we decide in the next year or so that number will change to 8, stay 9, go to 10, or even larger.  \n\nAn object larger than Pluto (2003 UB313) has been found, but we have not granted it official status as a planet. Don't expect this issue to be resolved any time soon, we've more or less "tabled" the issue until our general meeting in August, but there are a number of scientists in the IAU's Division of Planetary Sciences discussing this issue.\n\nRight now the newer astronomy textbooks generally have a section on "the planet controversy," and spend some time talking about all these newly discovered icy bodies.  They are all part of the Kuiper Belt, just like Pluto, and new books seem to be grabbing onto teaching about these objects much like the asteroids, addressing them as the left-overs of the formation of the solar system.  The Cosmic Perspective (a fairly decent intro astro textbook) for example has a chapter on "Remnants of Rock and Ice: Asteroids, Comets and Pluto"
1126158
There are almost 25,000 man-made objects: 8681 currently in orbit, and over 16,000 objects in a state of decay. Not every single satellite is included, since some are too small or too far away from home to be detected.
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A lot. At least 2000. Plus lots more space junk, old boosters, bits of metal, etc.
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1990 - Hubble Space Telescope put into orbit from space shuttle Discovery.\n1992- The Vatican under Pope John Paul II announces that the Catholic Church erred in condmening Galileo's work that proved that the work of Copernicus was valid, mainly that the planets circle the Sun and not the Earth.\n1994- Comet Shoemaker Levy crashes into Jupiter.\n1995- Galileo space probe reaches Jupiter.\n1996- Comet Hyakutake discovered by Yuji Hyakutake.\n1997- Mars Pathfinder lands on the Red Planet.\n1997- Cassini begins its journey to Saturn.\n1998- The Lunar Prospector reaches the Moon.\n1998- Construction begins on the International Space Station.\n1998- Galileo discovers origin of Jupiter's Rings.\n1998- John Glenn returns to space after 36 years.\n1999- Scientists discover the real Hubble Constant!\n1999- Chandra X-ray Observatory is put into orbit. Col. Eileen Collins becomes first woman shuttle commander.\n1999- NASA loses the Mars Climate Orbiter and the Mars Polar Lander.
642903
As many, as there are stars in the universe.
385472
Our Universe is the only one that we know of.  Within our universe are at least a hundred billion galaxies.  Within our galaxy (assuming it is normal) there are a hundred billion stars.  That gives us (assuming the averages hold true) roughly 10,000,000,000,000,000,000,000 (ten sextillion) stars in the known universe.
1064998
A report from September, 1997 counts almost 25,000 man-made objects: 8681 currently in orbit, and over 16,000 objects in a state of decay. Not every single satellite is included, since some are too small or too far away from home to be detected.
36214
1995?  see source for details!
606528
200 billion stars in the Milky Way.