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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. Ethnicity Testing: Where Has Your DNA Been? By Pete McFraser Summary: For example, one person may obtain a result of 80% European 20% East Asian, while another may type as 33% African, 22% East Asian and 22% European. The DNA test is accurate to from 4-8% and sensitive enough to detect, for many customers, a single (100%) African or European great-great-grandparent or a single (100%) East Asian great grandparent. Article: Have you ever wondered referring to your ethnic origin? Do you know for sure where all your artificer were from and which countries'… 2. Lighter Than Air Tubular Flight By Lance Winslow Summary: The top of the device would be solar powered for use in internal rudder control, surveillance equipment and polymer muscle material (with memory) which would use small electrodes to bend in-flight like a snake.One immediate use could be a sensor, which would lay underwater or in a buoy and if wave action from a Tsunami was sensed, would inflate and deploy andArticle: I propose a lighter than air tubular unmanned mini lighter-than-air craft be designed. Such a craft would have many grea… 3. The future of the Human Species - Part 2:Where next? Summary: Mars is the nearest planet to Earth and scientists actually think that the red planet resembled our Earth some million years ago. Astronomers have already discovered a Jupiter-like planet orbiting a Sun-like star so why not an Earth-like planet orbiting a Sun-like star next?'Astronomers clearly think that, yes, there has to be other planets alike to Earth waiting to be colonised out there. Article:Many scientists are currently exploring the idea of going to live on Mars. Mars is the nea… 4. DNA Testing Has Changed Everything By Avi Lasarow Summary: DNA analysis has now superseded blood testing and is the most accurate method currently available for human identification.The possibility that DNA could be used for human identity and relationship testing had been discussed from the time DNA was first revealed as the molecule which makes people unique. As with conventional fingerprinting, where various loopsArticle: Since its discovery 20 years ago, the use of DNA for human identity and relationship testing has emerged as a powerful t… |
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