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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. An Introduction to Alternative Energy By Peter Lenkefi Summary: Countries across the world are being pushed into investing money into the research and production of alternative energy and many countries already have natural energy sources producing usable energy.Wind energy.One of the first used forms of alternative was wind energy. The problem with wind energy is that turbines can't be located near housing diArticle: What are fossil fuels?Essentially there are three fossil fuel sources unmanned to the world but each of them are dwindling. The most… 2. UAV Air-Breathing SAM Upgrade Recommendations By Lance Winslow Summary: Can a hybrid Surface to Air Missile, UAV loiter for hours and then become a missile to down an enemy aircraft?Small UAV surface to air missile (SAM), which is air-breathing is a good idea and yields many possibilities to the future of air combat.http://www.shephard.co.uk/UVOnline/Default...6a-10526cb81f17Now we need to design a beyond line oArticle: Can a hybrid Surface to Air Missile, UAV loiter for hours and then wax a missile to down an enemy aircraft?Small UAV surface to air missi… 3. Laser Ionization Airflow Tunnel Flight Theory By Lance Winslow Summary: I believe their is a way to have an on board aircraft laser the air in front of it and move the air out of the way, thus less friction at lower altitudes, no sonic booms and rapid acceleration no induced or parasite drag at low altitudes. Most of the super heated or blasted air exiting down compacting the sides of the tube and setting up a boundary made of thinArticle: I suppose their is a way to have an on go aboard carrier laser the air in front of it and move the air out of the wa… 4. Hair Style 2006: Short and Curly Summary:2005 was all about long hair - post 'Sex and The City,' and very 'Desperate Housewives.' Yes, once again, 2005 hairstyle trends were driven by what was happening in celebrity world and hairstyles were dominated by long, highly-coiffeured locks and - with the Jennifer Aniston look still reigning supreme and the Sedu hair straightener selling in big numbers - straight hair was definitely the style of choice. But, new year, new styles - so what will be the 2006 hairstyle trends? Short, Shor… |
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