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| | Light year - Wikipedia, the free encyclopedia |
 | | For a list of lengths on the order of one light year, see the article 1 E15 m. | | | This audio file was created from an article revision dated 2005-06-27, and does not reflect subsequent edits to the article. | | | Units related to the light year are the light minute and light second, the distance light travels in a vacuum in one minute and one second, respectively. |
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http://en.wikipedia.org/wiki/Light-year
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| | SPEED OF SOUND AND LIGHT YEAR DISTANCE MILES OR KILOMETRES PER HOUR CONVERSION TABLES SPEED ACE NELSON KRUSCHANDL. |
| | In 1983, the General Conference on Weights and Measures defined the metre as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 of a second (i.e. | | | Wear of the ends, oxidation, etc. became major issues in the quest for ultimate accuracy. | | | The first quantitative estimate of the speed of light was made in 1676 by Ole Rømer, who was studying the motions of Jupiter's satellite Io with a telescope. |
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http://www.speedace.info/speed_of_sound_and_light_year_distance.htm
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| | The Basics of Light |
| | This simple equation basically ties together the particle and wave nature of light by permitting us to convert back and forth from wavelengths to photons and photons to their corresponding wavelengths. | | | This is somewhat more difficult for most people to understand, but perhaps an analogy with sound waves will be useful. | | | However, the atom has to lose energy to do this, and so it releases a photon of the same energy as the one it absorbed (albeit most likely into some other direction from which it was absorbed). |
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http://fuse.pha.jhu.edu/~wpb/spectroscopy/basics.html
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| | light-year -- Encyclopædia Britannica |
| | Nothing is visible to humans when light is totally absent. | | | In that spectrum the wavelengths visible to humans occupy a very narrow band, from about 7 105 centimetre (red... | | | Lecture to track history of attempts to measure the speed of light. |
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http://www.britannica.com/eb/article-9048225
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| | The UnMuseum - Speed of Light |
| | Long distance calls that have been routed over one or more space satellites may cause a half second or so delay between the speaker and the listener. | | | Light coming from the sun takes eight and one half minutes to hit Earth. | | | When we flip on the light in a room there is no delay between when we first see the bulb start glowing and when light illuminates the far corners of the chamber. |
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http://www.unmuseum.org/speed.htm
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| | TeacherSource . Math . How Long is a Light Year? PBS |
| | Are any of the 9 planets within our solar system a light year or more from Earth? | | | Suppose that a child is born on Earth in the year 2000.You are on an imaginary planet that is 94.6 trillion kilometers away from Earth and looking through a very high-powered telescope and you witness this child's third birthday party. | | | Therefore, scientists use a unit known as the light year. |
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http://www.pbs.org/teachersource/mathline/concepts/space2/activity1.shtm
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| | light-year |
| | The Julian year of 365.25 days contains 31,557,600 seconds, so a light-year is 9,460,730,472,580,800 meters, or about 9.5 petameters. | | | Since 1983, by definition (see meter) light travels exactly 299,792,458 meters per second in a vacuum. | | | We see Proxima Centuri, not as it is now, but as it was 4.3 years ago, and the most distant object observed so far as it was 13 billion years ago (ignoring relativistic effects, which preclude a universal now). |
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http://www.sizes.com/units/light_year.htm
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| | FictionPress.Com Story : Light Year |
| | Suddenly Paul wondered if this is what the planet felt. | | | He wanted the low artificial glow of the SpaceHold's bulbs, not the bright intrusive light of the earthly sun. | | | John stood a few inches taller than Paul and was a year his senior. |
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http://www.fictionpress.com/read.php?storyid=1461259
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| | Light second - Wikipedia, the free encyclopedia |
| | A light second is a unit of length. | | | A light minute is 60 light seconds and a light hour is 60 light minutes or 3600 light seconds. | | | The mean distance, over land, between opposite sides of the planet Earth is 0.0668 light seconds (which also means that communications between opposite sides of the planet, taking a circumferential path, can never travel faster than about 67 milliseconds). |
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http://en.wikipedia.org/wiki/Light_second
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| | eSky: Light Year |
| | Because a light year is directly related to the time light takes to travel through space, it follows that we look out into the universe we also look back in time. | | | On an interstellar scale, though, a single light year is rather small. | | | Meet the neighbours: these are the star systems that lie within ten light years (or one 'light decade') of the Sun and Solar System. |
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http://www.glyphweb.com/esky/concepts/lightyear.html
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| | Light year - Simple English Wikipedia |
| | A light year is not a length of time, but the distance that light will travel in one Earth year (365 days), going at the speed of light. | | | Because light that leaves a star 100 light years away will take 100 years to get to us, this means that when we see the star's light, we are actually seeing that star as it was 100 years ago. | | | Because the universe is so big, some things are hundreds, thousands or millions of light years away. |
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http://simple.wikipedia.org/wiki/Light_year
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| | Light Year |
| | It takes light about 5½ hours to travel across the solar system, so a light year is much bigger than this. | | | The Milky Way Galaxy is a disc about 100,000 light years across and around 2000 light years thick. | | | A light year is a measurement of distance, not of time. |
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http://www.historyoftheuniverse.com/ligyear.html
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| | Zoom Astronomy Glossary: L |
| | The years 2001, 2002, and 2003 are not. | | | Breaking light into its various wavelengths is light dispersion. | | | Light can be broken up into into its component colors (for example, by passing light through a prism) - this is a spectrum. |
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http://www.enchantedlearning.com/subjects/astronomy/glossary/indexl.shtml
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| | Light year at Milan furniture fair |
| | This year, the glow from Euroluce 2005 could be seen across the continent. | | | One hit on, one hit off -- way more fun than the Clapper and a calorie-killer to boot. | | | The best part is that the user can move the light up, down and around within the chains. |
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http://www.post-gazette.com/pg/05127/500414.stm
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| | The Speed of Light |
| | More generally, light is part of what is called the electromagnetic spectrum, which includes infrared radiation, radio waves, gamma rays, X-rays, ultraviolet radiation, and so on. | | | Light Year: the distance that light travels (through a vacuum) in one year (9.46 x 10^17 cm). | | | So the light we see from the Sun represents what the Sun looked like 8 minutes ago, and we must wait another 8 minutes to see what it looks like "now". |
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http://csep10.phys.utk.edu/guidry/violence/lightspeed.html
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| | Light Year |
| | Could you explain what a light year is and give an example that I can understand or relate to. | | | You can find out the number of seconds in a year by multiplying the number of seconds in a minute (60) by the number of minutes in an hour (60). | | | A light year is the distance that light travels in one year. |
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http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980211a.html
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| | Understanding the Universe - DiscoverySchool.com |
| | This sounds like a unit of time, but a light-year is actually a distance: the distance that light travels in one year. | | | Once you look beyond our solar system, objects are so far away it takes more than hours or even days for light to reach us. | | | There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365 days in a year. |
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http://school.discovery.com/schooladventures/universe/itsawesome/lightyears
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| | Light Year |
| | A light year is a measure of distance. | | | A light year is simply the distance light can travel in one year. | | | It would take about a year for light to travel from the sun to Pluto 1,600 times. |
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http://eastmemorial.greeleyschools.org/space/ly.htm
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| | light |
| | , the human eye is sensitive to only a tiny part, the part that is called light. | | | and black light, which have a frequency greater than that of visible light. | | | If white light, which contains all visible wavelengths, is separated, or dispersed, into a spectrum, each wavelength is seen to correspond to a different |
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http://www.factmonster.com/ce6/sci/A0829744.html
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| | BBC NEWS UK England Lancashire Blackpool marks 126th light year |
| | Lights are stretching beyond the promenade for the first time in 126 years with a "festival of light". | | | Last year Blackpool celebrated the 125th anniversary of the free show. | | | The switch-on, adjacent to Coral Island, was broadcast live on Radio 2 - the station which will host Evans' new Saturday radio show. |
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http://news.bbc.co.uk/2/hi/uk_news/england/lancashire/4205670.stm
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| | Dairy Foods: 1989 - a 'light' year for new dairy product entries - New Product Review |
| | Grand Rapids-based Country Fresh, Kraft, Borden and many other suppliers produce 2 percent milkfat cottage cheese, which is sometimes described as Lite Cottage Cheese. | | | Hood Light, Dreyers Grand Lite, Breyers Natural Light and others showed that consumers wanted self-indulgence and self-control in the same product. | | | PHOTO : The use of the word "light" is heaviest where it means the most to consumers - frozen dairy desserts. |
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http://www.findarticles.com/p/articles/mi_m3301/is_n12_v90/ai_8169605
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| | Halfbakery: Light Year Cube |
| | I'd pay 5 bucks to go up in one, just to hear people try to comprehend the sheer length of a light year. | | | Why not just use a meter stick with "One light year. | | | It's quite difficult to imagine such a number of meters, so the idea is to build a CUBE, the volume of which was the number of cubic milimeters, equal to the number of meters in one light year. |
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http://www.halfbakery.com/idea/Light_20Year_20Cube
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| | Chandra :: Photo Album :: Note on Cosmic Distances |
| | We assume throughout the Photo Album a value of the Hubble constant that corresponds to a recession velocity of 600 kilometers per second for a source at a distance of 30 million light years or 10 million parsecs (H0 = 60 km/s/Mpc). | | | In astronomy, distances are measured in units of light years, where one light year is the distance that light travels in a year—10 trillion kilometers. | | | At present it is known to an accuracy of about 20 percent, so we usually modify distances by saying "about 100 million light years," for example. |
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http://chandra.harvard.edu/photo/cosmic_distance.html
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| | Light Year |
| | A light-year is the distance traveled by light moving in a vacuum in the course of one year, at its accepted velocity of 299,792,458 meters per second (186,282 miles per second). |
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http://abyss.uoregon.edu/~js/glossary/light_year.html
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| | light-year |
| | the distance traversed by light in one mean solar year, about 5.88 trillion mi. |
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http://www.infoplease.com/dictionary/light-year
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| | The Galactic Gazetteer: 50 light year map |
| | All systems within 50 light years of the Sun. | | | This is Version 1.0 of the applet (as you can see there is a lot of space for new control functions). | | | If you have any suggestions for things you'd like, please pass them on. |
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http://www.starmapping.co.uk/close.cfm
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| | Light Year |
| | A light year is practical for measuring distances between stars and nearby galaxies but not measuring distances within the solar system. | | | A light year (Ly) is the distance that light travels in one year. | | | Calculating the actual distance that light travels in one year is simple: |
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http://www.kinderscience.com/light_year.htm
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| | Light Year Long Pole Spinning |
| | Since the speed of sound in iron is 5130 m/s, it will take about 58,500 years before the far end realizes the near end was twisted. | | | It takes a year for the light from the end other end of the pole to reach your eyes. | | | You don't see the motion until a year after it happens. |
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http://www.newton.dep.anl.gov/askasci/phy00/phy00770.htm
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| | PPT Slide |
| | The speed of light in a vacuum, denoted by c, is 3 x 10 | | | You may have heard that the speed of light (in a vacuum) is the ultimate speed limit in the universe. | | | Consider how many seconds there are in 1 year: |
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http://www.csus.edu/indiv/p/phelpsr/Teaching/UCDavis/Astr002/Introduction/Lecture_Introduction/sld003.htm
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| | Phil Plait's Bad Astronomy: Misconceptions |
| | This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years). | | | One of the people sitting there timidly raises his hand and says, "How about if we say `light years' instead?", and some Bad Astronomy was born. | | | So the light year is a measure of distance, not time, even though it has the word "year" in it. |
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http://www.badastronomy.com/bad/misc/light_years.html
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| | What is a light-year and how long is 1 light-year? |
| | It would take you three years to get to number 31,536,000 if you could write one number per second for eight hours per day. | | | A light year is the distance between two points in space that it would take light to travel when the distance between the two points in time are one year. | | | But light can do this same thing in one second! |
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http://www.physlink.com/Education/AskExperts/ae502.cfm
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| | Light Year Data |
| | You will need to report your distances using scientific notation. | | | Using this piece of information, determine how far light travels in 6 months (in meters). | | | In other words, light travels at "3.0 times 10 to the eighth" meters per second. |
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http://www.njesta.org/panther/lightyeardata.html
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| | Seattle City Light: Year 2000 - FAQ |
| | City Light is one of the control areas in the western grid that includes 13 states and 31 separate control areas owned and operated by different electric utilities. | | | In the case of a widespread phone line outage as well as an electrical outage, City Light plans to communicate with its customers via radio. | | | City Light's power system has its own dedicated communication systems, so the Utility does not have to rely upon external providers for its system communications. |
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http://www.cityofseattle.net/light/y2k/Y2k_FAQ.asp
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| | Cape Neddick "Nubble" Light |
| | They developed a lively business ferrying tourists across to the island and giving tours. | | | Decorations on such utilitarian buildings are rare and so far no story has been unearthed about how this charming touch was added. | | | That same year, the keeper and his family also received indoor plumbing. |
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http://www.cyberlights.com/lh/maine/nubble.htm
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| | Space Exploration: Light year |
| | The moon is only about 1 1/2 light SECONDS away!!), so a spacecraft at light speed would get there in 8 years, being 8 light-years away. | | | By the way, the light year is at the speed of light through a vacuum (186,272 miles per SECOND), and that speed is a bit slower through glass, air, water, etc. | | | If a spaceship could travel at the speed of light, how long would it take to reach a star 8 light years away. |
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http://experts.about.com/q/Space-Exploration-2540/Light-year.htm
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| | CNN - A 96-year-old light bulb: It's still going - Mar. 25, 1997 |
| | It's not efficiency they worry about, but longevity, as they wonder how much longer their little night light will give off its warm glow. | | | About 40 million of these lamps, with their bright, hot lights, have been sold. | | | Such technologies are of no interest to the staff of the Livermore Fire Station, however. |
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http://www.cnn.com/TECH/9703/25/longest.lasting.bulb
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| | Light Truck Average Fuel Economy Standard, |
| | As already noted, NHTSA lacks detailed information on the extent to which the manufacturers are using the various available fuel efficiency improving technologies in their current light truck models and the extent to which they plan to use them in the 2004 model year. | | | In particular, EMSC argued that hybrid technology used in cars could be applied to light trucks. | | | Title V has been codified without substantive change as Chapter 329 of Title 49 of the United States Code. |
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http://www.nhtsa.dot.gov/cars/rules/rulings/Cafe/LightTruck/NPRM-final.htm
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| | If a Millimeter Were a Year/Light-Year, Note 1 |
| | This means a Light Year is 9,460,528,401,200 km. | | | This is the point where the two values begin to diverge. | | | The Parsec is often used in astronomy instead of the Light Year. |
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http://www.friesian.com/notes/note-f.htm
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| | Kelty Light Year Sleeping Bag: 45 Degree Down - Free Shipping! |
| | This bag won't take up much room in your pack and is so light you may forget that you're carrying it. | | | Bottom Line: This Kelty is Light Years ahead of other low priced bags. | | | Light Years ahead of my old gear ! |
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http://www.backcountry.com/store/KEL0379/Kelty-Light-Year-Sleeping-Bag-45-Degree-Down.html
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| | 01/22/92 - What is a light year? |
| | Light from the sun travels with a speed of about 300,000,000 meters per second. | | | By multiplying the speed of light by the number of seconds in one year, we find that one light-year is equal to 9.5 x 10 | | | A light-year is defined as the distance light travels during one year. |
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http://www.pa.msu.edu/sci_theatre/ask_st/012292.html
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| | Light-year · Astrological definition of Light-year · Astrology Encyclopedia |
| | For the Sun: Light breaking into many colors as it passes through a prism. | | | An astronomical Unit is the mean distance of the Earth from the Sun, about 92,930,000 miles, where it is found in April and October, at which time the Sun's light reaches the Earth in 499 seconds, or about 8 minutes. | | | Correction of Mean to Sidereal Time · Transit · Transit of a planet across the Sun · Transitor · Translation of Light · Transmutation · Trigon · Trigonocrators · Trimorion · Trine · Trinities · Triplicities · Tropical Signs · Tropical Year · True Solar Day · Trutine · Twilight |
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http://www.astrologyweekly.com/dictionary/light-year.php
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| | How Long is a Light-Year? |
| | To obtain an idea of the size of a light-year, take the circumference of the earth (24,900 miles), lay it out in a straight line, multiply the length of the line by 7.5 (the corresponding distance is one light-second), then place 31.6 million similar lines end to end. | | | It is the total distance that a beam of light, moving in a straight line, travels in one year. |
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http://www.grc.nasa.gov/WWW/K-12/Numbers/Math/Mathematical_Thinking/how_long_is_a_light_year.htm
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| | Livermore's Centennial Light |
| | Welcome to the homepage devoted to the Longest burning Light Bulb in history. | | | Our little light will be making a guest appearance if all goes well. | | | Keep an eye out for the third edition of Ripleys Believe it or Not, around winter of 2006. |
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http://www.centennialbulb.org
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| | APOD: 2000 March 21 - HH111's 12 Light-Year Star Jet |
| | torus of dark dust and gas from which the stars formed millions of years ago can be seen. | | | this Hubble Space Telescope image taken in visible light, successive bubbles are seen to move along the jet. |
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http://antwrp.gsfc.nasa.gov/apod/ap000321.html
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| | light-year |
| | “Light-year” is always a measure of distance rather than of time; in fact it is the distance that light travels in a year. | | | Please, Star Wars fans, don’t bother sending me elaborate explanations of why Solo’s speech makes sense; I personally heard George Lucas admit in a TV interview that it was just a mistake. |
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http://www.wsu.edu/~brians/errors/lightyear.html
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