which is the celestial body which comes to our notice once in 75 years?
606220
That would be Halley's comet. I remember seeing it - very blurredly - in 1986.\n\nA bit of background info on the comet it's been known since at least 240 BC and possibly since 1059 BC. Its most famous appearance was in 1066 AD when it was seen right before the Battle of Hastings. It was named after Edmund Halley, who calculated its orbit. He determined that the comets seen in 1531 and 1607 were the same object that followed a 76-year orbit. Unfortunately, Halley died in 1742, never living to see his prediction come true when the comet returned on Christmas Eve 1758. \n\nHalley's Comet Statistics\nPerihelion distance: 0.587 AU \nOrbital eccentricity: 0.967 \nOrbital inclination: 162.24° \nOrbital period: 76.0 years \nNext perihelion: 2061 \nDiameter: 16 x 8 x 8 km
1056496
No one really knows that answer except God. The signs are in the Bible. There are no specific dates, just things to be aware of. I personally dont see it happening in the next 100 years. But thats my opionion.
671474
Define "any time soon."  \n\nThe Andromeda Galaxy is on a collision course with our galaxy.  The two will run into each other and merge to form a single galaxy.  Of my two sources, one says three billion years from now (UToronto) and one says five billion (Hayden).\n\nIf it is more like five billion, that will make it the least of our worries.  Our current estimates for the lifespan of the Sun is about five billion years, and since after that time we can expect the Sun to become a red giant and swallow Mercury, Venus, Earth, and Mars, if you want humans to be around to watch, you need to support a viable space program.  \n\nIf it happens sooner, there may be intelligent terrestrial life around to watch it.  Very slowly, the Andromeda galaxy will appear bigger and bigger in the sky.  It will merge with the Milky Way galaxy, and we will see two arches of stars (like our current Milky Way) in the night sky.\n\nThis will cause some gravitational fluctuations, and stars will get thrown around.  (When I say thrown here, I mean in a process that happens over hundreds of millions of years.  No one is getting whiplash over this.)  What happens to Earth depends on where we end up.  Our Sun and its planets may end up getting thrown out of the galaxy, in which case we will have a very dark night sky.  We may end up getting thrown deeper in toward the galactic center, in which case the sky will get much brighter at night.  In fact, the galactic center is home to so many giant stars that we might get several supernovae per year from stars so close that would light up the night sky as if the Sun were shining.\n\nIf I could invent time travel, I think that's when I'd like to go.
117139
The answer to your question is yes.  What you are observing in the sky is what happened in the past, in your example 100,000 years ago.
1165999
There are several comets every year that are visible in binoculars or a small telescope. The recent passage of 73P/Schwassmann-Wachmann was particularly interesting because the comet broke into pieces. \n\nAbout the only bright comet in a regular, predictable orbit is Halley, and it won't be back for another fifty years. Comets like Hale-Bopp are rare, coming along maybe every twenty years on average. These large bright comets pass through our solar system after getting kicked out of the Oort cloud by some gravitational disturbance.  The Oort cloud is a huge spherical cloud of cometary bodies that surrounds the sun at a distance of about a light year. It is too far away to be observable, so we have no idea when the next big comet will come. Hale-Bopp was discovered twenty months out, so you could get plenty of advance notice. However, other, smaller comets sometimes put on a spectacular display on short notice, if they pass very close to the Earth.\n\nThere are links below to some comet observation sites. You will see that there are always comets around, but most of them are strictly telescopic objects.
326775
Every 75 to 76 years.
192275
The next time Haley's comet will pass by earth will be in 2061. We see Haley's every 76 years.\n\n1066- First appearance of Haley's comet(it was named much later)\n\nSubesequent sightings:\n1471, 1607, 1682\n\n1785 -  Haley's Comet appears. Haley's comet is named after English astronomer Edmond Haley who 'discovered' it and predicts when it will pass us again.\n\nThe last time Haley's passed is was in 1986.  It was rather far away and not a spectacular site to see. I highly doubt that I will live long enough to see its next passing.
810232
It is estimated that Earth is bombarded by a city-sized asteroid once every 65mil yrs.\ni) Assuming a Poisson distribution, find the probability that Earth will be hit by 2 or less of such asteroids in the next 10000yrs.\nEta Carinae is a suspected hypernova that is 7000 light-years away from Earth. Scientists have observed 200 of such star in many distant galaxies. It was found that the stars have an average life-span of 200mil years with variance 2500mil yrs^2.\nii) Construct a 95% confidence interval for the mean lifespan of Eta Carinae, giving your answer correct to 8 significant figures.\nIt was found later that Eta Carinae was formed 200.01mil yrs ago. \niii) Using the sample of 200 stars earlier, a scientist boldly claimed that Eta Carinae will explode today, causing devastation to Earth in 7000years’ time. By stating clearly the null and alternate hypothesis, test the scientist's claim at 5% level of significance.\nYou may assume the normality of the population of stars observed.
586293
Is there something significant we should know about the Winter Solstice date of December 21, 2012? Yes. On this day a rare astronomical and Mayan mythical event occurs. In astronomic terms, the Sun conjuncts the intersection of the Milky Way and the plane of the ecliptic. The Milky Way, as most of us know, extends in a general north-south direction in the night sky. The plane of the ecliptic is the track the Sun, Moon, planets and stars appear to travel in the sky, from east to west. It intersects the Milky Way at a 60 degree angle near the constellation Sagittarius.\n\nThe cosmic cross formed by the intersecting Milky Way and plane of the ecliptic was called the Sacred Tree by the Maya. The trunk of the tree, the Axis Mundi, is the Milky Way, and the main branch intersecting the tree is the plane of the ecliptic. Mythically, at sunrise on December 21, 2012, the Sun - our Father - rises to conjoin the center of the Sacred Tree, the World Tree, the Tree of Life..\n\nThis rare astronomical event, foretold in the Mayan creation story of the Hero Twins, and calculated empirically by them, will happen for many of us in our lifetime. The Sun has not conjoined the Milky Way and the plane of the ecliptic since some 25,800 years ago, long before the Mayans arrived on the scene and long before their predecessors the Olmecs arrived\n\n\nIt will be the last date on this calendar. Check the foll link for more
407784
About the same location it is now.  Yes the sun is orbiting the galactic center, but so is everything around us.  Our radial distance will not change dramatically in such a short period of time, and our motion within the solar neighborhood really is not that great either.\n\nSo in short, right here.\n\nOh, and you are reading way to much into the turn-over of the Mayan long count callender.  That date has more to do with thier counting system than anything else.
246014
astronomy and astrology
984760
You'd have to contact an observatory to find out where it was in the sky in 11/98 but with an orbital period of 165 years, it hasn't moved far relative to us. Pluto, of course, is no longer considered a planet.
95335
Astronomers will tell you the Sun is dated at 4.5 billion years old\n\nhttp://www.astro.uiuc.edu/~kaler/AstroBrief/chapter12/sunage.html\n\nThe Sun will one day become a white dwarf and be the fiery death the Bible claims God will bestow upon us.\n\nhttp://imagine.gsfc.nasa.gov/docs/science/know_l2/dwarfs.html\n\nPersonally, I think it's all a farce:\nhttp://www.celestialproducts.com/BA.asp\n\nor maybe I'm just angstrom's away from reality. hmm. I wonder, but not for too long as I may contract Homer Simpson syndrome.
133292
The US government will tell the truth about contact with extraterrestrials when it actually happens.\nNow go put your tinfoil hat back on.
425143
Yes, but not in our lifetime.  The orbit is 1,500 years from our sun to a dead sun outside our solar system.  We have a better chance of meeting helpful space visitors than planet X.
663331
well astrologically its the planet of re-birth and transformation
395085
yeh, a meteorit and a galaxy are coming to earth. Don't worry, they come only after 2 milion years...;))