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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. How the Meter Came To Be Summary: Barely a year later, in March 30, 1791, has this same assembly accepted the new proposal of the French Academy of Sciences which adhered to the second approach: that the new definition of the meter would be equal to one-fourth the polar circumference of the world. It must be noted that the circumference of the Earth, if measured through the poles, is about forty million meters. In December 10, 1799, the French National Assembly then specified that the final standards would be accordin… 2. Feb. 12 is "Darwin Day" -- Secular Americans Celebrate B'day of Evolution Champ By Duncan Crary Summary: "If people had a better understanding of both we wouldn't be embarrassed in front of the rest of the world by cases such as the one currently going on in Dover, Pa., where administrators are walking around local classrooms talking about 'intelligent design' and other nonsense," he said.Pigliucci's course on "Evolution, Creationism and the Nature of Science" iArticle: This Feb. 12 marks the 196th festivity of Charles Darwin's birth!The day has special significance for America's nearly 3… 3. H2S Overview By Austin Culley Summary: It should be noted, however, that using smell as a way of determining the presence of H2S is not reliable, as the sense of smell can be quickly eliminated in the presence of the gas.H2S can seriously injure or kill exposed individuals. Training programs and proper equipment must be provided for all workers who deal with the presence of H2S gas in their envirArticle: H2S is naturally formed when spirochaete overcome down organic material in the non-appearance of oxygen. This formation … 4. … |
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