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Topic: Light year

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	Light year - Wikipedia, the free encyclopedia
		More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely distant from any gravitational or magnetic fields, in one Julian year (365.25 days of 86 400 seconds each).
		The light year is often used to measure distances to stars: a light year is not a unit of time.
		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.
	en.wikipedia.org /wiki/Light-year (519 words)

	Howstuffworks "What is a light year?"
		That doesn't make much sense because "light year" contains the word "year," which is normally a unit of time.
		Light travels at 186,000 miles per second (300,000 kilometers per second).
		A light year is 5,865,696,000,000 miles (9,460,800,000,000 kilometers).
	science.howstuffworks.com /question94.htm (469 words)

	Chandra :: Photo Album :: Note on Cosmic Distances
		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.
		According to Hubble's law, the universe is expanding in such a way that distant galaxies are receding from one another with a speed which is proportional to their distance.
		One of the central problems of modern astronomy is to accurately determine Hubble's constant, which is a measure of the rate of expansion of the universe.
	chandra.harvard.edu /photo/cosmic_distance.html (263 words)

	What is a light-year and how is it used??
		It is the distance that light can travel in one year.
		Light moves at a velocity of about 300,000 kilometers (km) each second.
		So in one year, it can travel about 10 trillion km.
	starchild.gsfc.nasa.gov /docs/StarChild/questions/question19.html (352 words)

	Light Year Long Pole Spinning (Site not responding. Last check: 2007-09-19)
		However, the linear velocity of the part on the periphery is traveling faster that at the center because it must travel further to complete one trip around the full 360 degrees.
		Even an idealized pole the atoms cannot move at a speed exceeding the speed of light, their mass would increase as their speed approached that of the speed of light.
		It takes a year for the light from the end other end of the pole to reach your eyes.
	www.newton.dep.anl.gov /askasci/phy00/phy00770.htm (543 words)

	Light Year (Site not responding. Last check: 2007-09-19)
		A light-year is the DISTANCE which light can travel in a year.
		As light is fast, a lightyear is a long way!
		In a year there are 60 x 60 x 24 x 365.2425 = 31,556,952 seconds.
	www.zyra.org.uk /light-yr.htm (103 words)

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