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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. Hobbits and Lice By Robert Baird Summary: I think the divergence of human lice proven through DNA technology going back 1.18 to 1.8 million years ago is even more telling and I look forward to the further research on pubic lice that might prove hominids cross-breeding. They don't survive for more than a few hours away from human flesh.The war between lice and their hosts has continued for billions ofArticle: HOBBITS AND LICE:In late 2004 the media was all agog with the small hominids found on Flores Island where I had written … 2. How to Make a Thermometer Summary: You can even make a thermometer yourself, it's simple. Here's what you'll need: - Water (plain old tap water will do just fine for this experiment.) - Rubbing alcohol - 1 clear plastic bottle with a narrow neck - Food coloring in your choice of color - See-through plastic drinking straw - Modeling clay. Article:A thermometer is an instrument that measures the temperature. Depending on what country you live in, temperature is measured either in a scale named Fahrenheit or Celsius (someti… 3. characteristics of sound Summary: Examples of sounds sources is: A violin string that vibrates upon being bowed or plucked. The four characteristics of sound are frequency, wavelength, amplitude and velocity. The frequency of sound is the number of air pressure oscillations per second at a fixed point occupied by a sound wave. A sound wave is caused literally by increases in pressure at certain points causing a 'domino effect' outward, the higher pressure points are the crests in a sound wave, and behind them are low pr… 4. The Fertilization Process and Implications of Test Tube Babies By Richard Waller Summary: The results are babies known as test-tube babies which are technically conceived outside the womb.In a natural scenario, the conception of a baby occurs when the ovum, travels from the ovaries, through the fallopian tube to be fertilized by the sperm of the father during sexual intercourse. This procedure has been becoming increasingly common through technoloArticle: Through the wonders of science, infertile couples who were previously unable to bear children, due to reasons such as sl… |
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