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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. Get Hot on Combustion! Summary: Fortunately, these explosions are protected from persons as these engines are called internal combustion engines.Whatever type of combustion, it is a chemical reaction between carbon, hydrogen, sulphur and oxygen.C + O2 = CO22CO + O2 = 2CO2H2 + O2 = 2H2OS + O2 = SO22S + 3O2 = 2SO3Air consists of 77% Nitrogen and 23% Oxygen by mass. These will react with the water, also a byproduct of combustion of Hydrogen to form sulphuric acid and sulphurous acid.SO3 + H2O = H2SO4SO2 + H2O = H2SO32H2S… 2. Chemical Element Silver By Ryan Fyfe Summary: Copper has replaced silver in several instances due to it's hire cost, this is especially true for electrical purposes.Silver has a number of other notable characteristics:- Silver has the whitest color of any metal - Silver has the highest thermal conductivity of any metal - Silver has the lowest contact resistance of any metal - Silver haArticle: Silver, a non-acid element, exists in the periodic table with the symbol "Ag" and solitary number 47. Silver is a soft white lustrous trans… 3. Atlantis through Science By Robert Baird Summary: Entitled 'Evidence for an Abrupt Change in Climate close to 11,000 years ago', it advanced the theory that a 'number of geographically isolated systems suggested that the warming of world-wide climate which occurred at the close of Wisconsin glacial times was extremely abrupt. More significantly, it was found that the bottom waters of the Cariaco Trench in the CaribArticle: ICE AGES: - The impact of the ice ages and inter-glacial effects on the rise and fall of ocean levels and the pla… 4. Big Bang Booming - Back to the Future Summary: That would wait until Einstein's General Relativity would be interpreted by other scientists through further mathematical analysis. His contemporaries demonstrated to Einstein that his new Theory of General Relativity published in 1916 was not compatible with a 'static' universe of space time. Einstein's view of perfection in an unchanging space time continuum had led him down a blind alley as much as Aristotle's concept of perfection had brought that great philosopher into the error of… |
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