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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. An Introduction to Hydro Energy. By Peter Lenkefi Summary: One such renewable energy source is hydro energy and involves using water to turn turbines, which in turn generates electricity creating hydro energy. some dams provide enough power for up to 10,000 people so it really is an effective form of creating energy for our homes.It's highly unlikely that you have a good enough source of running water running thArticle: What is hydro energy?Fossil fuel reserves have render seriously depleted but conversely our energy use is increasing year on … 2. UAV Defense, UAV Recovery, Material Research, Infected Birds with Virus Plastic Net By Lance Winslow Summary: When Manufacturing nets of any type: Going for strength and light weight is a challenge and it has been the compromise of many for so long in the battle to find the strongest net, sheet of plastic to mimic that of a Spider's web we have endured to no end. For instance this material is incredible and could be used in fishing, agriculture, netting flocks of birds Article: When Manufacturing nets of any type: Going for strength and light weight is a stare down and it has been the comprom… 3. Hyper Sound Wave Emissions to Quiet Helicopters By Lance Winslow Summary: It is possible to disrupt the sound waves coming from a flying helicopter and re-direct those sound waves up. the actual sound from the helicopter rotor blades and the aircraft's engines along with the introduced hyper sound waves together would also be studied perhaps at the Boeing Companies Apache Attack Helicopter Center to make sure that the sum of the Article: It is possible to disrupt the sound waves lurking from a flying helicopter and re-direct those sound waves up. This would… 4. Material Memory, Impressed? By Lance Winslow Summary: Even more impressive is when making such manufactured material devices we can apply an electrical pulse to them to contract and then when released from the current they go right back again, great for flapping bird wings, automatic door openers or multitude of needs, you simply allow your mind to wonder across the many areas of science, different industries and potenArticle: Currently we see some incredible advances in the technology of material memory manufacturing. In trucking they ma… |
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