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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. CAN ASTEROIDS DESTROY THE WORLD? Summary:Title: CAN ASTEROIDS DESTROY THE WORLD?Author: Arthur ZuluContact Author: mailto: controversialwriter@yahoo.comCopyright: Copyright ' Arthur Zulu 2002Word Count: 504Web Address: http://www.1stbooks.com/bookview/10975Publishing Guidelines: Permission is granted to publish this article electronically or in print as long as the bylines are included. You could tell when Halley's comet would come, but you cannot be sure of comet Hale-Bopp.Thank Heavens for the atmosphere. Only a few pieces of… 2. WILL A PLAGUE DESTROY THE WORLD? Summary:Title: WILL A PLAGUE DESTROY THE WORLD?Author: Arthur ZuluContact Author: mailto: controversialwriter@yahoo.comCopyright: Copyright ' Arthur Zulu 2002Word Count: 452Web Address: http://www.1stbooks.com/bookview/10975Publishing Guidelines: Permission is granted to publish this article electronically or in print as long as the bylines are included. To die of a disease with an exotic name -- Oropouche, Chikungunya, O'nyongnyong, or to die of one with a familiar name -- AIDS, Ebola, Cholera,… 3. Confusing MAV Optic Flow Sensors In flight Using Mobiles By Lance Winslow Summary: Using Shapes on Mobiles to confuse optic flow sensors in Micro Air Vehicles appears to be feasible. By using the optical flow sensors a new technology of mind boggling proportions the tiny MAV would take send out pulses and capture images, as the next pulse sees the image again it is bigger, this way the tiny MAV can sense when it is really big and getting closeArticle: Using Shapes on Mobiles to confuse optic flow sensors in Micro Air Vehicles appears to be feasible. Today we are stu… 4. Alternative Energy Series Fast Burn Conversion Summary: All carburetor air vents should be plugged so engine vacuum signals draw only from the unvented carburetor fuel bowl, which is connected to the fuel bubbler in the tank or racing fuel cell. If we never meter more fuel than can burn in half a power stroke, we avoid meltdown while maximizing power and fuel economy, minimizing exhaust emissions. With fast burn, we want to retard initial spark timing to between sixty and eighty degrees after top dead center. Better that a fuel supply line d… |
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