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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. A Brief History of Creation - Part One Summary: In spite of the fact that it is impossible to prove that anything exists beyond one's perception since any such proof would involve one's perception (I observed it, I heard it, I thought about it, I calculated it, and etc.), science deals with a so-called objective reality 'out there,' beyond one's perception professing to describe Nature objectively (as if there was a Nature or reality external to one's perception). As will be shown in the following, the required paradigm shift from '… 2. Glyco Nutrients & Stem Cell Production By Zach Thompson Summary: During the speach, Dr. Reg McDaniel talked about first seeing new stem cells in the peripheral blood of clients using glyconutrients many years ago and not recognizing these cells as stem cells. There is an article in the June Scientific American if you want to read more about stem cells.A New STEM CELL SURVEY CD for the Health Care Professional will be aArticle: During the speach, Dr. Reg McDaniel talked in connection with first seeing new stem cells in the peripheral form of clients… 3. Energy Aware and Waste Wise By Dave Brummet Summary: These are little boxes that divert the heated air from the dryer into the house during the cold and dry winter months ' making better use of your energy dollar while saving a little on heating costs. Homes with dry static air or wood heat would benefit from the moisture, but buildings that already have a moisture problem (evident by mould and mildew or sArticle: Constantly bombarded with negative information haphazard the environment, finances and natural resources? Feeling ov… 4. UAV Stealth and Radar Energy Capture for Power and Propulsion By Lance Winslow Summary: Also realize that if the inside of the foam contains a substance which can absorb the radar of the enemy into the composite and then use that energy for power of the craft, by way of chemical reaction or enhancement of the battery pack, then you can use the enemies radar to self propel your aircraft, UAV, MAV (micro-air vehicle).CO2 is the most efficient laseArticle: A Feasible Idea for UAV Flight, Possible Research and Development Test; UAV Stealth and Radar Energy win the laurels for… |
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