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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. The Measurement Problem in Quantum Mechanics Summary: Maybe our very ability to measure, to design measurement methods and instrumentation, to conceptualize and formalize the act of measurement and so on ' are thus limited and 'designed' as to yield only the 'collapsible' solutions of the wave function which are macrocosmically stable and 'objective' (known as the 'pointer states')?Most measurements are indirect - they tally the effects of the system on a minute segment of its environment. The overall increase of order in the Universe shou… 2. Patterns and Flows on Earth By Lance Winslow Summary: However once all those factors are known it will not be as difficult as it once appeared.Now let's take the atmosphere which can change rapidly and has to take into consideration the ocean flow, temperature, height of the waves along with the heat of the land mass which could include; Article: We all see the patterns, cycles and flows of our current home planet and indeed we understand much roughly how they work. But we need to know more and understand the current ambient fill-in cycle… 3. How Satellite TV Systems Originated By Zahid Saddique Summary: What we know as satellite tv actually had its origins in the space race which began with the launching of the satellite Sputnik by the Russians in 1957. As the use of satellites for communication and broadcast purposes increased, it became evident that everyone had the potential to receive satellite signals for free.Direct to Home (DTH) satellite receiverArticle: What we know as satellite tv in reality had its origins in the space race which began with the launching of the satellite S… 4. Stem Cells (The Truth) By Stephen Ayers Summary: When a stem cell divides, each new cell has the potential to either remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell or a red blood cell. Thus a stem cell can become a neuron, a liver cell, a brain cell, a fingernail cell, or any other cell that needs to be replaced or repaired.Because recent progressArticle: The much publicized stem cell research debate focusing on moral arguments is off target with the goal of real progress i… |
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