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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. Evolution VS. Creationism By Sunny Sambhara Summary: p.5), these scientists find flaws with the common practice of pairing the widely accepted and empirically supported microevolutionary theory with the much broader and less empirical theory of macroevolution.Microevolution can be studied in laboratories and in nature over time, and its focus is on the mutations that occur in individual species due to enviroArticle: The theory of evolution and the hubris in a Creator have long been considered separate and mutually exclusive realms of… 2. Creative Evolution Summary: All of these factors explain how the plane functioned in the earth's atmosphere, yet they also explain why the Wright Brothers built the plane the way they did. The Wright Brothers studied birds in flight and paid very close attention to how the birds flexed their wings when turning in the air, but had a very difficult time figuring out how they could make their plane turn in the air. Physics can explain why birds can fly, but what physics cannot explain is how nature could figure out … 3. Asbestos - What It Is And How It's Used Summary:In this, and a series of articles that will follow, we will cover asbestos, what it is, how it's made, what it's used for, the health risks of asbestos exposure and how to protect yourself against asbestos. Asbestos isn't actually one thing. There are over 5000 products that contain asbestos including sewage piping, roofing and siding, electric switchboards, table pads, heat protective mats, heat resistant blankets and curtains, paints, adhesives, caulking, and the list goes on and on. B… 4. Space Junk Collection Device Described By Lance Winslow Summary: The Carbon nano tube collection device will be set up like a sandwich similar to the devices used to shield against space junk on satellites, this will insure the captured space junk will remain lodged in the material so it will become part of the collection device.This entire device will be powered by the electromagnetic energy coming from the earth as it isArticle: Space Junk orbiting the is a real problem for our space assets. The debris is orbiting the Planet at 17,500 miles per h… |
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