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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. June 2005: Weather Forecasts for Vacationers By Ken Paone Summary: The first is the area around Brownsville, Texas and the other lies in the southeastern Gulf at around 86 West longitude and 24 North latitude.June 12, 2005: Around this time the storms shown over the Front Range and Texas should arrive over the Mississippi Valley and continue eastward.June 13-15, 2005: Cold, dry air invades the Rockies with theArticle: If Johannes Kepler, the renowned 17th ten-spot astronomer and discoverer of the planetary laws of motion, could speak from the heavenli… 2. Lagrangian Points and Nasa's Plan to Explore Space Summary:October 3, 2005 Nasa is relying on its ability to determine the Lagrangian points between every set of planets, moons, asteroids, etcetera it intends to explore in order to implement its plan of successful interplanetary space exploration. How this relates to Nasa and its plans for future space travel is that they have the ability to find the solutions of these formulas to determine the Lagrangian points lying between adjacent planetary bodies along the proposed route of space travel. A… 3. The Hidden Truth Behind an Emblem Summary:An emblem is a visual representation that defines an idea, thought, or an entity. To have a better understanding of their more profound meaning, let us trace back their origin and study the ideas that were rooted behind these colorful signs. The word emblem first began to surface within the confines of the argot of architecture during the 15th century. During the early 20th century, it gained the recognition of an emblem that stands for good luck and prosperity. Other notable emblems ar… 4. An Immortal Horse By Robert Baird Summary: Egyptian scholars know there is little other than fiction that can be written about the civilization that lived on the banks of the Nile in far more recent times than the beginning of the 'Old Copper Culture'. The area of the Snake River in east central Minnesota may have been the site of copper mining when the glaciers covered the Great Lakes. In this book, BleArticle: Egyptian scholars know there is little other than fiction that can be written just about the refinement that lived o… |
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