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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 Don't Moths Fly to the Moon? By Vernon Stent Summary: For instance, you may keep the moon at 45 degrees to your left, and as the moon is relatively static in the sky, you would be sure to travel in the same direction. "The Moon Just Moved!" Now, to a moth, with its poor eyesight and fairly simply outlook on life, a street lamp that is only 3 feet away may look pretty much like the vast moon that is Article: Surely, in the days by choice man invented contrived light, moths would have been approaching to the only light source at night - th… 2. How Rubber Molds Are Made By Delmar Germyn Summary: In order to give you some idea of the process involved in making a rubber or latex mold, here is a quick rundown.Part 1 - The easy part, decide what it is you want to copy or make your mold of and get one.Part 2 - This is the long part. Look at the wood to see how thick your test paint is.Part 3 - After the paint has dried for 2 or 3 days yArticle: In order to give you some idea of the process involved in making a rubber or latex mold, here is a quick rundown.Part 1 - The easy part, … 3. Ser� que o nosso Universo � Finito? Summary: Sempre ouvimos e aprendemos que ele seria infinito, mas cada vez mais os cientistas est'chegando a conclus'que ele tem um fim e este pode ser a sua pr'a idade que est'stimada em 15 bilh'de anos, j'ue se imagina que o Universo se originou e expandiu somente depois do Big Bang, como a idade estimada 'e 15 bilh' Pensando que a expans'tenha sido uniforme, o Universo n'ter'ais que 15 bilh'de anos luz de Raio, isto 'imaginando que a expans'ocorre na velocidade da Luz, o que n''erdade. Hoje, o… 4. Unlocking the Mystery of Life Summary:Review of the Intelligent Design video 'Unlocking the Mystery of Life' Do molecular machines such as the incredible flagellar motor prove an intelligent designer? How could DNA evolve? Are the claims of this video valid or just another form of pseudoscience? Article:Review of the Intelligent Design video 'Unlocking the Mystery of Life' Do molecular machines such as the incredible flagellar motor prove an intelligent designer? How could DNA evolve? Are the claims of this video valid or ju… |
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