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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. Johnson Space Center Hit Hurricane Rita By Lance Winslow Summary: Johnson Space Center is famous for its history. Well still today Johnson Space center serves our nations space efforts. Houston, that is to say the famous Johnson Space Center will be as big a part of that as they were during the Apollo Space Missions.What about those in the International Space Station? As a matter of fact it might be safer in a Colony onArticle: Johnson Space Center is famous for its history. Remember the saying; “Houston we have a Problem” when astronauts were conve… 2. Preventing Hydrogen or Helium from Leakage in Dirigibles By Lance Winslow Summary: NASA is even planning high altitude sub-space upper atmosphere stations, which will be giant balloons and may even be used to orbit Mars in the Marian atmosphere as airborne space stations?Carbon Nano Tube Sheets are 50 times the strength of steel by weight, which makes them absolutely perfect for balloon, blimps and dirigibles. Article: In the operation of blimps one thing that is extremely important is making sure the gas does not escape. If the gas escapes from a lighter-than-air pl… 3. 747 Onboard Laser Might Cause Mistake and Identity By Lance Winslow Summary: The concept is a good match of the latest and greatest technology and the worlds most stable platform, even entrusted to carrying the space shuttle.On Board Laser 747 Concept:http://www.ast.lmco.com/SSC/images/gallery/missileDef/airborne_laser/abl2_lo.jpgOne possible advantage to an airborne laser missile defense system is that since it looks liArticle: Remember when the Russians shot down a Korean Airlines 747 accidentally, which was 4 degrees off it’s course and flew over Russian Air… 4. Top 10 Tips for Safely Handling and Using Gas Cylinders Summary: To improve your chances of preventing hazardous accidents, follow these Top 10 Tips for … |
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