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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. How Glow Sticks Work Summary: How Glow Sticks Work...Glow sticks are fun party supplies.' When sending out your party invitations, think of the interesting Chemistry involved with your party favors.''Glow sticks work by a chemical reaction called 'chemiluminescence' which causes light to be generated.' (That's a trivia question for some party games!)' By breaking up the word chemiluminescence into 2 parts, chemi and luminescence we can better understand.Luminescence is emission of light not caused by a rise in tempe… 2. We Have Come Along Way in Our Exploitation of Transportation By Lance Winslow Summary: It is essential that we should continue research on all types of new and improved methods of transportation such Magnetic Levitation Trains, Hyper-Sonic Aircraft and space craft, Pelican type super transports, Mega-Cargo Blimps, Air-Cushioned Trains, Self Driving Trucks, Smart Cars, Pilot-Less Trains, UAVs, Underwater Unmanned Vehicles, RLV-Reusable Launch Vehicles Article: We sure have come as well way since the horse and motorcar or the first Model T that left the devising line. We h… 3. DNA Testing Breaks Down Barriers in the Court Room By Avi Lasarow Summary: The technology is so sensitive that it allows identification of a person by analysing DNA collected from a fingerprint left on the surface of an object or from a single hair left at a crime scene.When a crime scene sample or a sample from a suspect is analysed, a DNA profile is produced. In the UK, all crime scene DNA profiles together with those of all suspeArticle: DNA testing has three major applications for forensic studies: identification of missing persons; identification of vict… 4. Tsunami Defined By Joe Upsurge Summary: Tsunami is a Japanese term that describes a large seismically generated sea wave which is capable of considerable destruction in certain coastal areas, especially where underwater earthquakes occur.In Japanese, 'Tsunami' means 'Harbor Wave' or 'Wave In The Harbor' It is now internationally accepted as the term that defines a Article: Tsunami is a Japanese term that describes a large seismically generated sea wave which is up to of considerable destruction in not surprised determinativ… |
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