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Topic: Light minutes

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In the News (Fri 1 Jan 10)

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	Using light therapy at home to treat seasonal affective disorder (SAD)
		Light therapy is treatment with a special type of light that is much brighter than a lamp or other light fixture in your home.
		Studies vary as to whether light therapy at other times of the day is less effective, but some people with SAD (perhaps those who wake up normally in the early morning) should do their light therapy for 1 to 2 hours in the evening, ending 1 hour before bedtime.
		The safest light is fluorescent, not full-spectrum or ultraviolet light.
	www.webmd.com /depression/Using-light-therapy-at-home-to-treat-seasonal-affective-disorder-SAD (1121 words)

	Light minute - Wikipedia, the free encyclopedia
		A light minute (also written light-minute) is a unit of length.
		It is defined as the distance light travels in an absolute vacuum in one minute or 17,987,547,480 metres (~18 Gm).
		To give an example, the average distance from the Earth to the Sun (or 1 astronomical unit) is 8.317 light minutes.
	en.wikipedia.org /wiki/Light-minute (102 words)

	The UnMuseum - Speed of Light
		Light travels at a speed of 186,000 miles a second or 700 million miles an hour.
		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.
		The distance light can travel in a year is called a "light year." The light year is one of the basic measures of distance for astronomy.
	unmuseum.mus.pa.us /speed.htm (556 words)

	Learn more about Speed of light in the online encyclopedia. (Site not responding. Last check: 2007-10-11)
		In 1999, a team of scientists led by Lene Hau were able to slow the speed of a light beam to about 61 km/h.
		In 2003, Mikhail Lukin, with scientists at Harvard University and the Lebedev Institute in Moscow, succeeded in completely halting light by directing it into a mass of hot rubidium gas, the atoms of which, in Lukin's words, "[behaved] like tiny mirrors" (Dumé, 2003), due to an interference pattern in two "control" beams.
		The speed of light was first measured in 1676, some decades after Galileo's attempt, by Rømer, who was studying the motions of Jupiter's moonss.
	www.onlineencyclopedia.org /s/sp/speed_of_light.html (1171 words)

	The UnMuseum - Speed of Light
		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.
		When astronauts were on the Moon it took over a second for the radio waves (which travel at the speed of light) carrying their voices to reach us.
		The distance light can travel in a year is called a "light year." The light year is one of the basic measures of distance for astronomy.
	www.unmuseum.org /speed.htm (556 words)

	Discount Hydroponics - Light Movers
		Light Movers are specifically designed to utilize higher intensities by making light available to a greater area.
		Light movers will allow all plants to receive the same amount of light.
		The Light Rail 3.5 has the ability to move 1 light 6 feet, or up to 12' with the optional extension rail.
	www.discount-hydro.com /lightmovers.asp (380 words)

	Wikinfo \| Light year (Site not responding. Last check: 2007-10-11)
		The most distant space probe, Voyager 1, was 13 light hours away from Earth in September 2004, less than two tenths of one percent of a light year.
		The observable part of the universe has a radius of about 46 billion light years, but light from the edge of the observable universe was emitted only 13.7 billion years ago (the age of the universe).
		Contrary to popular belief, the universe is not expanding at the speed of light, and is not 13 billion or even 46 billion light years across; it is, in fact, much larger, maybe infinite.
	www.wikinfo.org /wiki.php?title=Light-year (548 words)

	Dr (Site not responding. Last check: 2007-10-11)
		When light therapy is stopped, symptoms do not usually reappear for a few days, so most people can stop the treatment for one or two days without much problem (e.g., for a weekend trip).
		When there is a good response to light therapy, some patients like to experiment with the timing and duration of daily light exposure, e.g., by reducing the daily exposure to 15 minutes, or using the light at a more convenient time of the day (e.g., 7:00 p.m.).
		If light therapy is restarted, use a shorter exposure time (e.g., 15 minutes per day) or sit slightly farther away from the lights.
	www.psychiatry.ubc.ca /mood/sad/lightbox.htm (754 words)

	Light Acne Treatment got treatment bonus 7 months ...
		Acne is a cruel disease, and UV phototherapy light treatment is technically
		Treatment of acne through blue light therapy is a gentle, non-invasive...
		Light ultra-violet rays are used for acne, and t Learn about Light Treatment Acne Our light process destroys the bacteria which causes acne.
	www.rpgpub.net /p5.html (575 words)

	A100 at IUN, Fall 1996: Lecture 4.2: The Nature of Light
		Since light is the only way Astrophysicists have of studying these objects, they have had to be very clever and resourceful to try and extract the most information out of the light they can gather.
		Light waves also have a wavelength and this is precisely what distinguishes the different types of light that we talked about.
		So the fact that light doesn't travel instantaneously between two places combined with the fact that objects in the Universe are so far apart make it so that when we look at celestial objects we are seeing them the way the looked in the past.
	astro.uchicago.edu /home/web/lucia/a100/lectures/light.html (2812 words)

	Labs from YSI 94 - Measuring the Speed of Light.
		Light travels so quickly that it seems to be instantaneous - we are normally not aware that is has a speed at all.
		Light takes 1.28 seconds to travel from the Moon to Earth, and 500 seconds or 8.3 minutes to travel from the Sun to Earth.
		The number for the speed of light you will find in a textbook is probably in miles per second or in kilometers per second.
	astro.uchicago.edu /cara/outreach/resources/ysi94/light.html (1262 words)

	Howstuffworks "What is a light year?"
		Light travels at 186,000 miles per second (300,000 kilometers per second).
		Therefore, it has taken the star's light 1 million years to get here, and the light we are seeing was created 1 million years ago.
		If the sun were to suddenly explode right now, we wouldn't know about it for eight minutes because that is how long it would take for the light of the explosion to get here.
	science.howstuffworks.com /question94.htm (469 words)

	Understanding the Universe - DiscoverySchool.com (Site not responding. Last check: 2007-10-11)
		There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365 days in a year.
		Light travels at 186,000 miles per second, which is about 37,200 times faster than the shuttle.
		Light from the moon—which is very, very close in space—takes about 1.3 seconds to travel to Earth.
	school.discovery.com /schooladventures/universe/itsawesome/lightyears (374 words)

	Getting the Most Out of Your Light
		Side effects usually result because too much light has been used or the eyes are not used to bright light, and need to be acclimated to the light.
		This can be easily avoided by using the light for only a couple of minutes at a time and very gradually increasing the amount of light used each day.
		If you’ve used the light according to the assessment test, talked with your doctor about using combination therapy, and have experimented for at least 3 – 4 weeks without noticing a change, you probably won’t respond to light.
	www.apollolight.com /new_content/light_therapy/getting_the_most.html (1329 words)

	Velocity of light Roemer
		Rømer never did compute the speed of light, maybe because he felt that the distance between the Earth and the Sun was not known too well.
		In that, he uses the diameter of earth's orbit and Rømer's value for the light's delay in travelling over the orbits diameter to calculate the speed of light (he was the first to present the velosity with terrestrial units, 16
		This could be understood as the Earth moves just as long in the time of the 80 revolutions of Io as light moves in 22 minutes.
	www.rundetaarn.dk /engelsk/observatorium/light.htm (898 words)

	How Light Box Treatments Affect Sleep
		Bright light will suppress the production of the sleep inducing hormone, melatonin, and it usually takes a couple of hours before melatonin will again be released.
		As you respond to light therapy and awaken at the time that you need to wake up you may reduce your light therapy time to 15 minutes and see if you are able to maintain the later awakening time.
		People that have trouble falling asleep, awaken frequently, and seem to be awake half the night need to use light as a circadian pacemaker since their circadian rhythm could be split.
	www.lightboxresearch.com /site/704067/page/205815 (856 words)

	Physics 7 Lecture #1 - Through the Universe at the Speed of Light
		Light passing through the cluster from an object located behind it can be focused and amplified to produce one or more images of the background object.
		The four bright spots in the forground are lensed images of a spiral galaxy lying behind the cluster.
		The Hubble Deep Field, the deepest space photograph taken to date shows galaxies billions of light years away, as they were when the Universe was only a fraction of its current age, believed to be 10--20 billion years.
	cassfos02.ucsd.edu /physics/ph7/Intro.html (1909 words)

	fUSION Anomaly. Light (Site not responding. Last check: 2007-10-11)
		The speed of light is normally about 186,000 miles per second, or fast enough to go around the world seven times in the wink of eye.
		It takes light one second to traverse 186,000 miles, and since these galaxies are trillions of miles away from us, we are observing these galaxies as they existed millions of years ago.
		networks, are built with light, of light, and for light, to hasten its spread around the world.
	fusionanomaly.net /light.html (3144 words)

	The Light Cone: Einstein-Minkowski Spacetime
		Stan receives ("sees") the light emitted from events F and B simultaneously, and concludes that: "since I am midway between the marks on the tracks, and since the speed of light is a constant, then events F and B are simultaneous."
		Mo receives ("sees") the light emitted from event F, then from B, and concludes that: "since I am midway between the marks on the train, and since the speed of light is a constant, then events F and B are NOT simultaneous: F occurred before B."
		So, it must have taken light one minute (that is, half the roundtrip-time) to get to X. Well, if it was there one minute after I sent the light-pulse out, my watch must have read 12:00 when the pulse reached X. Therefore, I say that "event X is simultaneous with event O."
	www.phy.syr.edu /courses/modules/LIGHTCONE/minkowski.html (1535 words)

	Powelson: January Dawn and Dusk
		Between Jan 22, 00 and Feb 18, 00 we have gained 34 minutes of light in the morning and 40 minutes of light in the evening.
		From solstice to Jan 21 the morning light increased 6 minutes and the evening light increased 31 minutes for a total of 37.
		The light is coming out of the ground and moving up through the dried grass.
	lcc.ctc.edu /faculty/powelson/project-light/jan.htm (351 words)

	Time travel is Now!
		The clock is 10 light minutes away from where you are standing.
		The light we see is 10 minutes to midnight, while the light behind that is midnight itself.
		Since the light that reflects off you takes a short time to reach me, I see the light of seconds gone bye; therefore, you look younger to me than you actually are.
	mypeoplepc.com /members/rckit/i4advantage/id6.html (580 words)

	The Expanding Light – A California Spiritual Retreat with yoga retreats, meditation, and teacher training
		From yoga and meditation teacher training to personal retreats, here you will find peace, healing, and the practical tools necessary to make them a reality in your life.
		Based on the teachings of Paramhansa Yogananda, and founded in 1968 by his direct disciple, Swami Kriyananda, The Expanding Light is a California retreat welcoming seekers from all backgrounds.
		The Expanding Light • 14618 Tyler Foote Rd • Nevada City, California, 95959
	www.expandinglight.org (227 words)

	ndxLocOut
		Two bright red lights in the sky, appeared low flying but totally silent almost as though they were travelling in the wind.
		It was close to 8pm in the desert when a light in the eastern sky was bright and light beams shot accross the evening sky.
		Bright white light that changed to red that was viewed at night over the ocean from the beach...
	www.nuforc.org /webreports/ndxsLight.html (5559 words)

	Protective Effect of Halothane Anesthesia on Retinal Light Damage: Inhibition of Metabolic Rhodopsin Regeneration -- ...
		(B) 20 minutes of exposure with 5,000 lux (5 klux) induced photoreceptor apoptosis as indicated by the condensed nuclear chromatin in the majority of the nuclei in the ONL (arrows).
		Rhodopsin was bleached by exposing mice to 5 klux of white light for 10 minutes (arrow).
		Retina of a rat not exposed to light.
	www.iovs.org /cgi/content/full/42/2/476 (3587 words)

	ABC 7 News - Poilce Warned of Failed-Traffic Light Before Fatal Crash (Site not responding. Last check: 2007-10-11)
		A county canine officer came across the failed light minutes later, asked that highway officials be notified and left.
		Livesay says the officer acted within his discretion in determining the light was not a major problem and leaving.
		As young as the driver was, she should have known, if she didn't then the driving school where she went didn't do their job and she didn't read the driving manual either.
	www.wjla.com /news/stories/0206/299541.html (806 words)

	Light-dependent subcellular translocation of Gq{alpha} in Drosophila photoreceptors is facilitated by the ...
		(A) 1-µm-thick retinal cross-sections of wild-type flies that were dark-raised (0 minutes) or light exposed for 5 minutes or 60 minutes.
		in the rhabdomeres from cross-sections of dark-raised wild-type flies, exposed to light for 5 minutes, 10 minutes, 20 minutes or 60 minutes.
		flies that were light exposed for 2.5 hours and then incubated in the dark for 60 minutes, 150 minutes or 240 minutes.
	jcs.biologists.org /cgi/content/full/117/20/4797 (5310 words)

	NightStar (Shakelight) Flashlights
		30 seconds of shaking provides 20 minutes of light....
		3 minutes of shaking provides 20 minutes of light....
		One minute of shaking proves 8 minutes of light....
	www.brightguy.com /manufacturer/nightstar.php (196 words)

	Astronomical distance (Site not responding. Last check: 2007-10-11)
		For instance, the Sun is 150,000,000 km away or 8 light minutes away.
		However even the vast light year is often too small a unit, the furthest known galaxies are at a distance of about 13,000,000,000 light years.
		Another often used unit, on the same order of magnitude as the light year is the parsec.
	omniknow.com /common/wiki.php?in=en&term=Astronomical_distance (1810 words)

	Encyclopedia Galactica - Au - Human (Anglic) Revised 351st Edition
		They are caused by the bombardment of the atmosphere with charged solar particles that are being guided along the planet's magnetic lines of force.
		Also known as northern or southern lights, or simply lights.
		Church of The Truly Re-Engineered Light to introduce converts to the tenets of hyperational anarchy and keterism.
	www.orionsarm.com /eg/a/Au.html (3356 words)

	Back to basics
		Two alternative ways of describing the behaviour of light – photons and waves – are introduced, then each of the different wavelengths of light is discussed.
		This explanation of what light is starts with visible light, giving a rainbow as an example of a spectrum, then light is put in the context of the rest of the electromagnetic spectrum.
		Astronomers use the distance that light travels in a year (at a speed of about 300,000 kilometres per second) as a convenient unit for distances – 1 light year is about 10 million million kilometres.
	www.science.org.au /scied/basics.htm (4464 words)

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