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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. What are Compound Microscopes? Summary: Two Dutch eyeglass makers named Zaccharias and Hans Janssen are credited with making the first compound microscope in 1590 by putting one lens at the top of a tube and another at the bottom of the tube. Viewers choose which strength lens they want and place it below the tube by turning the disk until the desired lens is in place. The stage and illuminator are below the objective lens. Article:Most of the microscopes used today are compound. A compound microscope features two or more len… 2. Coordination and Biotech Research Summary:One of the reasons why Africa and other poor regions of the world trail in crop biotechnology is lack of collaboration and coordination among scientists. Dr. Monty Jones of the Africa Rice Centre (WARDA), in a groundbreaking research, has developed New Rice for Africa (Nerica), resistant to drought and pests, which is bound to enhance food security in many West African countries. Organizations like International Maize and Wheat Improvement Centre (CIMMYT), Insect Resistant Maize for Afr… 3. Submarine Propulsion and Internet web sources By Lance Winslow Summary: Let us discuss the patent for the Submarine, which is now in the public domain, not that any foreign governments ever cared since they have been building them for years. The device he built is now called a Laser Ring Gyro Inertia Guidance system which is not nearly the size of the original the first one ever built by my Grandfather was six feet in diameter and Article: Let us discuss the patent for the Submarine, which is now in the public domain, not that any foreign governments eve… 4. The How TO of Pyramids Summary: 'Despite my familiarity,' he said, 'both with Pliny's style and the meaning he gives to terms, it has been difficult, sometimes even impossible, to translate the passages clearly and exactly.' The reason was certainly that he was unfamiliar with the substance that Pliny was describing...A passage from Book 31 of Pliny's encyclopedia made no sense to the French scholars. There is evidence of an advanced agriculture in the Nile that existed while the Sphinx was built and then left the are… |
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