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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. Portable Crowd and Protestor Control Systems By Lance Winslow Summary: These magnets will charge a capacitor and be hooked up to an LED lighting system using fiber optics or reflectors, each one hooked up to a .2 to .5 watt light. With hundreds of thousands of lights hooked up in a composite format it will face the rowdy crowd of hostile intent protestors.Currently this technology is being used in those little flashlights you seArticle: Each year we see protest groups which get out of hand in their protests, attempting to disrupt meetings or events. Often… 2. CAN ASTEROIDS DESTROY THE WORLD? Summary:Title: CAN ASTEROIDS DESTROY THE WORLD?Author: Arthur ZuluContact Author: mailto: controversialwriter@yahoo.comCopyright: Copyright ' Arthur Zulu 2002Word Count: 504Web Address: http://www.1stbooks.com/bookview/10975Publishing Guidelines: Permission is granted to publish this article electronically or in print as long as the bylines are included. You could tell when Halley's comet would come, but you cannot be sure of comet Hale-Bopp.Thank Heavens for the atmosphere. Only a few pieces of… 3. An Introduction to Hydro Energy. By Peter Lenkefi Summary: One such renewable energy source is hydro energy and involves using water to turn turbines, which in turn generates electricity creating hydro energy. some dams provide enough power for up to 10,000 people so it really is an effective form of creating energy for our homes.It's highly unlikely that you have a good enough source of running water running thArticle: What is hydro energy?Fossil fuel reserves have render seriously depleted but conversely our energy use is increasing year on … 4. Superultramodern Scientism (SSism) Summary: Critique of logical positivism - Logical positivism is a doctrine that if some theory ( that is supposed to be speaking about the nature of physical /material reality ) is not verifiable then it is meaningless or absurd. Critique of logical falsificationism - Logical falsificationism is a doctrine that if some theory ( that is supposed to be speaking about the nature of physical / material reality ) is not falsifiable then it is unscientific. Article:Superultramodern Scientism (SSism) i… |
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