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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. Aerodynamics of a Flying Disk or Flying Sphere By Lance Winslow Summary: Aerodynamics of a flying sphere. Here are some thoughts on the effect of the relative wind on the 322 nippled object, which has become a symbol of American Wealth and recreation and elite status.http://www.jsc.nasa.gov/er/seh/pg76s95.htmlWe know from studying UFO types of shapes that there are significant issues with vertical take-off spheres, the Article: Aerodynamics of a flying sphere. It has been said that in the future we maybe flying somewhere about anti-gravity type spheres, bu… 2. Genetic Genealogy Research Summary: These scientists chose to study Mitochondrial DNA (mtDNA) because of its three unique properties which they explain as: First, mtDNA gives a magnified view of the diversity present in the human gene pool, because mutations accumulate in this DNA several times faster than in the nucleus. Their findings also agree with the archaeology record as Cann explains 'Studies of mtDNA suggest a view of how, where and when modern humans arose that fits with one interpretation of evidence from ancie… 3. WILL THE UNIVERSE COMMIT SUICIDE? Summary: A courtesy copy of your publication would be appreciated.WILL THE UNIVERSE COMMIT SUICIDE?By Arthur ZuluOnce upon a time, there lived a madman who wanted to die a horrible death. And how did the universe begin?Scientists believe that in the beginning, space was one small dense point. If the universe began by expansion, and has since been stretching out, the believe is that someday, the universe will stretch itself out. Some imagine that one day, the universe will stop its expansion to o… 4. CAUTION! QURA'AN IS NOT JUST A BOOK .....READ TO LEARN THE MIRACLES OF QURA'AN part2 Summary: While destroying many meteors big and small as they approach the earth, it prevents them from falling to earth and harming living things.In addition, the atmosphere filters the light rays coming from space that are harmful to living things. The atmosphere also protects the earth from the freezing cold of the space, which is about minus 270oC.It is not only the atmosphere that protects the Earth from harmful effects. In addition to the atmosphere, the Van Allen Belt, a layer caused by th… |
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