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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. What are the Biggest Solar Projects? By Lance Winslow Summary: Solar power will be necessary for space exploration and off planet colonies on the moon and Mars in the next few decades and our advances here on Earth will assist us with the knowledge we need to power them up. How about the highest flying solar plane.http://www.dfrc.nasa.gov/Newsroom/FactSheets/FS-034-DFRC.htmlThere are many large solar projectsArticle: Solar power will be necessary for space exploration and off planet colonies on the moon and Mars in the next few decades and our a… 2. Chromatography - Hayrapetyan's Effect Summary: so: The main advantages of the proposed technology in practical analysis may be generated in the form of the following propositions: Attainment of maximum possible efficiency of the column on account of providing the optimal conditions of the analysis by keeping unchanged the linear rate of an imaginary point - the zone of the sample moved in time by the carrier-gas from the inlet to the outlet of the chromatographic column;Reduction of analysis time for a wide range of mixtures, which … 3. Zimbabwe and Biotechnology Summary: Many Zimbabweans cheated death by a whisker as their leaders haggled over whether to accept food aid, especially maize (corn) from the World Food Programme (WFP). The borne of contention was whether to allow WFP deliver genetically modified food to hungry Zimbabweans. But it confirms the fact that the hubris about the dangers posed by genetically modified food is, again, only informed by ignorance and disinformation. If milled genetically modified maize would be safe to Zimbabweans, why… 4. Telescopes, Principle of operation and factors that affect its properties Summary: Small telescopes that are used as toys are also capable of viewing some objects around 50 meters away. Principle in which the telescope works The principle in which the telescope works is very simple. The lens that picks up the light from the focal point is called the eyepiece lens. Factors that affect the viewing of the object The capability of the telescope to collect the light from the object that is viewed and the capability to enlarge the image are the factors that affect the effic… |
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