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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. The Glass We Know Summary: In fact, here's a tip for you: search the beaches to see if you've found pieces of sea glass (not naturally occuring but the kind that was thrown into the sea and molded by it after many years into smooth, round shapes) because they have lately become valuable and highly sought-after. It was naturally occuring glass, like obsidian (glass naturally created from volcaninc magma), that has been in use since the stone age. Low-emmisivity glass has metallic-based coatings that hinder the g… 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. New Generation of Anodizing Summary: Despite the many decades of experience and the expensive equipment employed by the traditional anodizing plants, the acid bath based DC anodizing process has severe limitations.' By the very nature of the low voltage DC power employed, the anodic coating is quite porous. Much as the traditional process, the Microplasmic process is an electrochemical process, but there ends the similarity. Because of the high voltage, a microplasma surrounds the electrodes and the oxygen ions produced in… 4. Hominid Inter-breeding By Robert Baird Summary: 'Kenyanthropus platyops': - Perhaps the 6,000,000 year old men found by a maverick who went behind the authorities back at the Olduvai Gorge will be proven to actually not be outside the australopithecine lineage. I love how these synchronicities occur and how much there is for us to know about ourselves."The 'Gang' Hits AgainThose fameArticle: 'Kenyanthropus platyops': - Perhaps the 6,000,000 year old men found by a maverick who went rump the directorate back at the Olduvai Gorge wil… |
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