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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. Why Condition Your Boiler Water? Summary: When steam is evaporated from the water, new water has to be added in to replace the water given out.As more and more steam is evaporated, the water becomes more and more concentrated with salts and other impurities. Corrosion can weaken the boiler.By treating the boiler water with chemicals, we can control the acidity of the water as well as the softness of the water. Article:A pan is used for generating steam. It does this by heating water to its burning hot point, thereupon which ste… 2. A Quick Start Guide to Auto Darkening Welding Helmets By Steve Bishop Summary: The sensor bar will help to alleviate any false alarm darkening of your helmet due to neighboring welders.Where can I find an auto darkening welding helmet? You can even purchase a helmet called the Hobart Hood Premium 770262 Auto-Darkening Welding Helmet. This helmet has the American flag painted on it.There are plenty of Internet resources availabArticle: If you are a welder you are most likely concerned with your safety. You take precautions by wearing a helmet while welding, bu… 3. Water Erosion Patterns Visible on Mars By Lance Winslow Summary: This is very exciting news for Space Exploration and seems to indicate if there is life on the planet next door, there must be life all over the Galaxy, so much life in fact that there must be lots of intelligent life out there too.We are also seeing such erosion patterns on Titan, which most certainly believed to be caused by liquid methane. Article: We have been getting some very interesting pictures back from our Mars Rovers, NASA is more excited than ever. These recently on Mars we… 4. Using High Altitude Blimp Cell Phone Communication By Lance Winslow Summary: By allowing high altitude Satellite Type Balloons or Blimps with Cell Phone type communications we could have a tremendous secondary back-up for communication. So you can track UFOs, Stealth or track ICBM from above to insure proper quadrangulation to intercept with a kill projectile.Currently micro satellite formations, AWACS and Spy Satellites are able Article: By admission high apex Satellite Type Balloons or Blimps with Cell Phone type communications network we could have a tremen… |
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