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Alan Boss on Earth-like planet discovered 600 light years away
The planet, 600 light years away, is called Kepler 22-b. EarthSky spoke with astronomer Alan Boss of the Carnegie Institution of Science. He's on the team of researchers that discovered Kepler 22-b. He told us: Today, we have for the first time ...

Speed of Light Lingers in Face of New Camera
“It is so much slow motion you can see the light itself move. This is the speed of light: there's nothing in the universe that moves faster.” Dr. Raskar says the technology has a variety of promising commercial applications. Last year, for example, ...

Fort Gratiot Light Station work wrapping up for winter
A year ago, Jake McKiernan would have been a little intimidated about facing the fifth-ranked... A program making strides from Year 1 to Year 2 is expected. For the past 11 years, a small committee of community volunteers has worked behind the scenes ...

McGarryBowen, Translation Land Bud Light
The hard-fought win caps a stellar year for Dentsu-owned McGarryBowen, following the recent addition of other blue-chip marketers such as Burger King and the merged United-Continental airlines. The agency will handle lead creative duties for Bud Light, ...

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KDForte Our tree this year! Love sitting by the tree light at night :) http://t.co/cjA5SgxV

carlos_theyeti @MyLifeAs_Selina isn't it like a year just going straight into space goin light speed (3,000 mph)

reikibyrickie Client today came in feeling the effects of less light this time of year. During her session, she felt a huge... http://t.co/4Eoz7hMn

weidertoooxee1 TheEllenShow Hey Ellen, thanks for ALL you do! LOVE, Light, and Health ALL year through . . . . ~JoDJl

emilyhorne1 RT @ashleyno: #IsItJustMeOr did this year move at the speed of light?

SydneyAlamode My 3 year old sister told me to bring my "light ass in the kitchen" wtf

ALotofNews1 New blog post : Light Year News & Updates http://t.co/ITmyYi0g

OneBlackBastard That Red Light party last year >>>>>

DarleneMcguire Debra Atlas: Light up the holidays this year efficiently http://t.co/apKaA6Ly

kaayy_rosee Someone give me a Buzz light year with pop out wings to give to the cutest kid in the world! #NEEDIT!

BPhamm I hope black light is sick this year...

Jameoxwba RT @AlfredWagner: Light holiday bookings follow difficult year http:tcoMmUGQKee

Rodriguez_Peter Drunk driver runs red light, kills woman, injures 4 year old http://t.co/y6OgyrAx

CrimsonWerewolf @LupusAnthropos @jason_mckinney It was the first geek fact I'd memorized as a four year old...Sirius the dog star, approx 4.3 light years...

Discussions

How long does light take to travel a distance of one light-year? by hayzman22 Q: How long does light take to travel a distance of one light-year?

A: 1 year That is where the expression light-year comes from.

What's the difference between a light year and an Astronomical unit? by Yay Area Q: A light year is the distance that light travels in a vacuum in one year. An AU is the measure within the solar system equal to the mean distance from Earth to Sun.

A: So you're asking what the difference is in miles? That's rather complex for calculators or anything. (186000 times 31536000) minus astronomical unit distance. Scientific Notation: (5.865696 * 10^12) - AU About 5.86 trillion miles minus the distance of an AU. I think around 5865603000000 miles, or 5.865603 trillion. Not very big in proportion.

What is a light year, how is it equal to 6 trillion miles? by JerseyTaughtMe Q: A light year is the distance that light travels in one year? So how is that equal to 6 trillion miles?

A: How Far is a Light-Year? A light-year is a unit of length used by astronomers to measure interstellar distance (the distance between stars). A light-year is defined as the distance that light will travel in a year. If the speed of light is 186,000 miles per second (300,000 km per second), then calculate the distance that light will travel in one year. Express your answer in miles per year. [Note: Cancel similar units above and below the dividing line. This process is known as "dimensional analysis."] . Solution: 186,000 mi/sec x 60 sec/min x 60 min/hr x 24 hr/day x 365 days/yr Answer = 6 trillion miles

What is a light year in the science of astronomy? by brownsucrose Q: In the science of astomomy, please explaine to this lay person the meaning of a light year.

A: A light year is the distance that light will travel in a year, or 9.46053E+15 meters. That's 63239.7 times further than the distance between Earth and the sun.

How do I calculate how many miles are in a light year? by Ashley Q: Ok so I know that there are 300,000 kilometers per second in a light year but I need to know how many miles per hour there are in a light year. How do I calculate that?

A: Convert seconds to years, multiply by 60 to get light minutes then by 60 again to get light hours then by 24 to get light days then by 365 to get years.

What is the period of time light travels in one Light Year? by Manoj Q: 1 light year is the time taken by light to travel the distance in 1 year (julian or Gregorian whatever). So if a particular planet / star is 100 light years away from earth, does that mean that light travels 100 years to reach earth. In other words whatever I see here from earth now is something that was or happened 100 years before.

A: A light year is a measurement of distance like a yard or a mile. A light year is the distance light travels in one year. in miles it is about six and a half trillion miles. And yes if a star is 100 light years away it means it took the light 100 years to get here. Any thing you observe is something that happened 100 years ago.

How many light year equal to one earth year? by florence539 Q: I know light year travel by light and earth year travel by time. Can you calculate how many light year equal to one earth year coz light is faster.

A: Indeed, a light year is the DISTANCE light travels in one year, it is not a time. If you, for reasons unclear to me..., want to know the distance in meters that light travels in one (earth) year, multiply the velocity of light (3 * 10^8 m/s) by the number of seconds in an Earth year (I always remember that that number of seconds is appr. pi * 10^7 seconds ;-)

What is the speed of light outside of a year? by Ophiuchus Q: There has got to be a simple formula for space travel. Light is a element or force ( what's it's label?) That cannot be bound by time boundaries.Once Light leaves the limits of 365 earthdays (a light year) or any of the planetary clocks, how fast does it travel? Imagine the Universe as a pond, The Galaxies are rocks in the pond we hop from rock to rock to cross the pond. Within each rock light is slowed down by Time & gravity. Once light escapes time frames & Objects of Gravitational mass it starts to leap from place to place "Light just Is", it can't live or die it does not fade away it's always moving and arriving from one place to the next. Gravity and Time allows us to capture light as if it were in slow motion. Without Gravity & time (which is only present within a solar system and the Galaxy, within the great year: one complete swirl of the Milky Way) there is no time limit or over baring gravity in the blackness of void therefore light can travel in a blink of an eye.

A: there are some theories that state that the universe can bend through dimensions, so that basically light can go from one side of the universe to the other in a second. in this theory, we can also say that if we are not within distance of touching something, that object could be on the side of the universe, and if we get closer to it, then we could also have gone to the other side, by way of dimensions. i dont know the names of these theories, but basically they assume that the universe it not flat(but rather bent and can move), and that the universe not only has 3 spatial dimensions + 1 dimension of time, but even more. string theory suggests 26 dimensions. light is considered masslass, if it were to travel faster than light (like theoretical tachyons) it could rip spacetime and create a wormhole. its all theory.

How can scientists mesure the distances of a light year of Stars in the others galaxies ? by dalia Q: "A light year is the distance that light will travel in a year. Light travels at 186,000 miles per second." the light year distance when comes from far in another galaxie. How to know that is 200 light years or other? How much time needs the sun light from the crown to reach earth? Thank you.

A: I presume your question is about determining distances to stars, and galaxies. For relatively near stars, the parallax method is used, where the orbit of the Earth around the Sun, with observations done 6 months apart, will create a very small, but still measurable, apparent motion of nearby stars against a much more distant background. For more distant stars, the spectral type to luminosity relationship is used. Since the stellar theory provides a relation between stellar type (the color of the star) and how bright it is in absolute term, how bright it appears as seen from here is thus a function of how far away the star is. For galaxies, yet another couple of techniques are used. One uses the variables stars, the brightness of which is a function of the absolute luminosity; and another one uses supernova, again, theory shows how bright they should be. Of course, this requires a supernova to be observed. Finally, there is the Doppler effect, as galaxies are usually moving away from one another in the expansion of the universe, the speed a galaxy is moving away from us correlates with how far it is; see about the Hubble constant for more details. The Earth is 8.3 light minutes from the Sun, these 8.3 minutes is how much time it takes for the light from the Sun to reach us.

Light year? by Fredy_4_Wheeler Q: how many years are in a light year? or is just a measurement of speed in space?

A: A light year is a measurement of distance...the distance of how far a beam of light will travel in one year, and is equal to 5,865,696,000,000 miles. The speed of light (how far a beam of light travels in one second) is 186,282.4 miles per second.

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