light-years time as distanceGretchen MendozaRhetoric & Information DesignInstructor Miso KimProject 1: Timea rhetorical ar...
what is a light-year?A light-year is a unit of length, equal to just under 10trillion kilometres, or 5.9 trillion miles. A...
who cares?The concept of light-years, a measure of time basedon distance traveled, is a very difficult one to compre-hend....
where might this information be made available?Classrooms, science exhibits, everyday articles.
why ?The space-time continuum is difficult to grasp.It needs distillation, and an improved senseof relevance on an earthly...
how ?A two dimensional representation or “map” oflight delays as we experience them on earth wouldsimplify the concept of ...
LIGHT-TIMEbecause of the scale and vastness in spacewe must measure distance in terms ofhow long it takes light to travel....
1 sec (moon) 8 min (sun)      1 hour    (saturn)      1 day      1 year
126,144,000 light-seconds                                                                                                 ...
126,144,000 light-seco                                                             starlight 4.2 light-year               ...
126,144,000 light-secondsstarlight 4.2 light-yearsthe nearest star proxima centauri = 24.8 trillion miles awayThe further ...
All light seems instant to us on earth.But because of the scale and vastness in space, we must measure distance interms of...
3,600 light-seconds                 480 light-secondsplanetary light 1 light-hoursaturn = 755.6 million miles away        ...
480 light-seconds                              1.3 light-seconds           instant                                        ...
sourcesPhoto sources:http://www.atlasoftheuniverse.com/milkyway2.jpg2D diagram sources:http://www.rlrouse.com/astronomy/li...
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  1. 1. light-years time as distanceGretchen MendozaRhetoric & Information DesignInstructor Miso KimProject 1: Timea rhetorical argument4 March 2010
  2. 2. what is a light-year?A light-year is a unit of length, equal to just under 10trillion kilometres, or 5.9 trillion miles. As defined bythe International Astronomical Union, a light-year is thedistance that light travels in a vacuum in one Julian year.The light-year is often used to measure distances to starsand other distances on a galactic scale, especially in non- When you search for “light-year” onspecialist and popular science publications. Googlethe first entry is a Wikipedia page showcases this diagram. Outer shell is one light year from Sun and left yellow line is Comet 1910 A1’s orbit. Inner shell is one light month.
  3. 3. who cares?The concept of light-years, a measure of time basedon distance traveled, is a very difficult one to compre-hend. The scale is beyond human comprehension inmany ways, and it tires the mind.Explaining time on this scale is a long-term effort.Many artists, philosophers, educators, scientistshave tried to put space-time into perspective before. Eames Power of Ten subliminal inspiration
  4. 4. where might this information be made available?Classrooms, science exhibits, everyday articles.
  5. 5. why ?The space-time continuum is difficult to grasp.It needs distillation, and an improved senseof relevance on an earthly, human scale.
  6. 6. how ?A two dimensional representation or “map” oflight delays as we experience them on earth wouldsimplify the concept of time over great distances.By basing the perspective largely on human-scaleterms, the phenomenon appears in a “grammar”we recognize, instead of science jargon.
  7. 7. LIGHT-TIMEbecause of the scale and vastness in spacewe must measure distance in terms ofhow long it takes light to travel.on the human scale, light is instant,but on the cosmic scale, the light we seeis a snapshot of light that shone in the past.HOW OLD IS YOUR LIGHT? nearest starlight delay 4 LIGHT-YEARS the nearest star, proxima centauri = xxxx miles away sunlight 8.3 LIGHT-MINUTES the sun = 93 million miles away moonlight 1.3 LIGHT-SECONDS the moon = 240,000 miles away the speed of light INSTANT at 186,000 miles per second
  8. 8. 1 sec (moon) 8 min (sun) 1 hour (saturn) 1 day 1 year
  9. 9. 126,144,000 light-seconds 3,600 light-seconds 480 light-seconds 1.3 light-seconds instant starlight 4.2 light-years light on the nearest star proxima centauri = 24.8 trillion miles away earth planetary light 1 light-hour saturn = 755.6 million miles away the speed of light = sunlight 8.3 light-minutes 186,000 miles per secondthe age 93 million miles away moonlight The further out we look into space, All light seems instant to us on earth. 240,000 miles away the farther back we see into time. But because of the scale and vastness in space, we must measure distance inof light terms of how long it takes light to travel. On the human scale, light is instant, but on the cosmic scale, the light we see is a snapshot of light in the past. This phenomenon is known as the space-time continuum.when we see it on earth undergraduate degree 4 years lunch break 1 hour average American shower 8 minutes cell phone delay 1 secondGretchen Mendoza Rhetoric + Information Design Spring 2010 not to scale
  10. 10. 126,144,000 light-seco starlight 4.2 light-year the nearest star proxima centauri = 24.8 trillionthe age The further out we look in the farther back we see inof lightwhen we see it on earth undergraduate degree 4 yearsGretchen Mendoza Rhetoric + Information Design Spring 2010
  11. 11. 126,144,000 light-secondsstarlight 4.2 light-yearsthe nearest star proxima centauri = 24.8 trillion miles awayThe further out we look into space, All light seems instthe farther back we see into time. But because of the scale and terms of how long it takes lig but on the cosmic scale, the l This phenomenon is knownundergraduate degree 4 years
  12. 12. All light seems instant to us on earth.But because of the scale and vastness in space, we must measure distance interms of how long it takes light to travel. On the human scale, light is instant,but on the cosmic scale, the light we see is a snapshot of light in the past.This phenomenon is known as the space-time continuum.
  13. 13. 3,600 light-seconds 480 light-secondsplanetary light 1 light-hoursaturn = 755.6 million miles away sunlight 8.3 light-minutes 93 million miles awaylunch break 1 hour average American shower 8 minutes
  14. 14. 480 light-seconds 1.3 light-seconds instant light on earth the speed of light =sunlight 8.3 light-minutes 186,000 miles per second 93 million miles away moonlight 240,000 miles awayaverage American shower 8 minutes cell phone delay 1 second not to scale
  15. 15. sourcesPhoto sources:http://www.atlasoftheuniverse.com/milkyway2.jpg2D diagram sources:http://www.rlrouse.com/astronomy/light-year.htmlhttp://map.gsfc.nasa.gov/media/091057/091057_diagram.pngText sources:http://en.wikipedia.org/wiki/Light-yearhttp://www.jimloy.com/astro/ly.htmhttp://emptv.com/images/spacetime-diagram-world-line.pngVideo sources:Wellesley Astronomy Professor: Light-year (E=mc2)Science on the Brain: What is a lightyear?Eames’ Power of TenMagnitudehttp://stargazing.suite101.com/article.cfm/solar_system_magnitude_scaleDistance/Scalehttp://www.freemars.org/jeff/planets/Luna/Luna.htm

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