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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. Living In Arizona Boulders--Where Did They Come From? By Robert Norman Summary: Northern Arizona to southern California are the most common locations for these statuesque boulders.Formed in the Precambrian age, 1.4 billion years ago, these rocks started life under the earth's surface as large masses of molten rock, according to Dr. Archie M. Article: When most people think of penthouse a secluded home, they think of tall trees and large bushes. But what in reference to boulders?Granite Park, located in Prescott, Arizona, which is in the north common part of the st… 2. The Finite Element Method: A Four-Article Series - Part 2 Summary: The author is an engineering consultant and expert witness specializing in finite element analysis. FINITE ELEMENT ANALYSIS: Pre-processing by Steve Roensch, President, Roensch & Associates Second in a four-part series As discussed last month, finite element analysis is comprised of pre-processing, solution and post-processing phases. The goals of pre-processing are to develop an appropriate finite element mesh, assign suitable material properties, and apply boundary conditions in t… 3. The future of the Human Species - Part 3: How do we engineer an Earth-like environment? Summary:The process of making an unearthly world more earth-like for the purpose of supporting human life is called teraforming - Steven Wintergerst.Teraforming Mars is the only way we, humans can live and reproduce thus starting all over again on the red planet. Mars is forced to remain as this unless we re-melt its core (that's a joke by the way).As written above, Mars has a small atmosphere and it should be prevented from completely vaporizing off. If ever we manage to crash a space rock on M… 4. Shedding Some Light on Laser Hair Graft Summary:We've all heard about laser hair removal but did you know that lasers are used in hair transplant procedures as well?The Food and Drug Administration approved laser hair grafting in the 1990s and it soon became a popular method of hair transplantation.Lasers are used to create tiny holes into which hair follicles are transplanted. Article:We’ve all heard haphazard laser hair removal but did you know that lasers are used in hair transplant procedures as well?The Food and Drug control evan… |
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