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One light year is the distance travelled by light (in vacuum) during one year. Therefore one light year equals (300 000 000*3600*24*365)m. A single light year is definitely huge: 9.46 trillion kilometres-no need to put this in digit form-in fact. A star that you see in the night sky is not one but many light years away. Article: When you look at the keen night sky, you see stars-those tiny diamonds suspended in the vast pitch-black emptiness. But stars shine because…? Our own sun, which is a star, emits light. Stars are like giant bulbs but are much more powerful. Light travels at a speed of 3.0*108m/s in vacuum and space is mostly vacuum. In other words light can cover a mighty distance of 300 000 000m in only 1 second! The thing is that 300 000 000m is a just one of those small amounts in space. Other stars are billions of kilometres-let impair metres-away. Astronomers in fact use light year as the unit for distance. One light year is the distance travelled by light (in vacuum) during one year. Therefore one light year equals (300 000 000*3600*24*365)m. A single light year is definitely huge: 9.46 trillion kilometres-no need to put this in digit form-in fact. But where exactly do I want to converge? A star that you see in the night sky is not one but many light years away. This means that it is very far away. But most importantly, it means that light from this particular star takes many years-and not mere seconds-to reach your eyes! So what? When you watch a star, you are positively only seeing the light it emitted years ago. At present, the star may be somewhere else in the night sky. (Stars do move in space). It might have deflected a little to the east or north or north-northeast. The star is still emitting light though. This light will however be seen in the following decades or even centuries; or simply next year. When you watch stars at night, you are for a certainty looking in the past. So who or what is time travelling? The star? You? Or light? The further something is from you, the further in the past you are penetrating into. Maybe then, someday, the newest technologies will be able to observe these seconds hind the Big Bang-if it ever occurred in the first place.
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Advice Home Business Technology Online Advertising Motivational Internet Marketing SEO Help Online Games Science Articles Happiness More Articles:1. The future of the Human Species - Part 1: Are we in danger? Summary:The sun, that celestial body which has always fascinated the human species, which differentiates night and day, which when angry, produces the fascinating auroras, is father to us all: humans, animals and plants. There are many other dangers waiting.Forget about the sun taking life away for a minute and think of a simple piece of rock floating in space. Article:The sun, that sublime body which has unvaryingly fascinated the human species, which differentiates night and day, which when an… 2. The Joy of Recycling By Barbara Hemphill Summary: (How many pairs do you have in your dresser drawer?)My mother had an enormous pile of overalls which my father no longer used, but she didn't know anyone who needed them. One day she heard a woman on the radio say that she wanted to buy overalls because she used the bib tops to make jumpers which she sold to raise money for her favorite charity. Article: I have systematically been an partisan of recycling. Even though I am not all the time convinced of its financial viability, I am … 3. Excuse me for living in a cave, but has the whole world gone crazy? Summary: If you don't believe me here's a picture http://en.wikipedia.org/wiki/Space_opera_in_Scientology_doctrine So, if all this has wet your appetite for a trip down the garden path into the mind of Hollywood Flakes with more money than sense, I suggest that you read the entire Wikipedia article http://en.wikipedia.org/wiki/ScientologY#Beliefs_and_practices You can find out what other saps have subscribed to the newsletter of nonsense that is scientology here: http://en.wikipedia.org/wiki/L… 4. Education and Time Summary: I long ago gave up reading what I already knew or felt comforted by. When Bucky did his first book it was on Einstein's Theory of Relativity - and I have argued these things on Quantum Physics sites over these past five years on the web and I find this is still true. Einstein directed it to his publisher. Godel, Wigner, and von Neumann are a good bet on that too. So when I argue with engineers and professors about these things I find that people who are at only the highest level of work… |
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