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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. Would You Care To Be Digitized? Summary:How is it to be digitized? Gibberish speaking, digitize, as explained in the field of computer science, is the conversion of any continuously different source of input, i.e., lines in a drawing, or a signal of sound, into a series of hidden units embodied in a computer through binary digits 0 and 1. Sampling sounds and the conversion of text that is on paper into computer files text are also ways of digitization. In simpler terms, to digitize is to turn an analog signal into a digital sy… 2. Monkey Brains Summary: In the first round of testing with the higher numbers, both monkeys who had been trained to respond in ascending numerical order arranged the new numbers correctly 75 per cent of the time.Later on, after tests where the answers were positively reinforced, all three monkeys responded correctly at a level above chance guessing.Dr. Terrace says, 'The results of these experiments provide compelling evidence that number is a meaningful dimension for rhesus monkeys.'It's not unusual that test… 3. Modification of Earth and Humans By Lance Winslow Summary: If we fail to modify our planet to serve at our needs, well then we must modify ourselves, through genetic manipulation, mitochondrion DNA and breeding to bring out the factors needed to sustain human life in the population concentrations of the future, which will go on.Mankind seems to be unable to control the need to procreate and therefore such an option wArticle: As we see in the movies and genres of consumptive events prevalent depicted in images on the silver screen we can unders… 4. The Intricacies of a Compound Microscope By Mike Spencer Summary: Have you ever used a compound microscope? Anton van Leeuwenhoek, considered the father of microscopes, was working in a store that made magnifying glasses and created ways to increase the magnification by grinding smaller and more powerful lenses.Then he began building microscopes and was among one of the first people to see bacteria and cells up close. Article: Have you ever used a compound microscope? Your first thought may be to reply to "no" but odds are if you had enzymology in… |
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