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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. Older C-130 Hercules Aircraft Problematic By Lance Winslow Summary: Here is the C-130 NTSB report:http://www.ntsb.gov/ntsb/brief.asp?ev_id=2...621X00954&key=1Here is the information about the C-130 that went down.http://www.ruudleeuw.com/tanker130.htmIt happened once before in 1994http://www.ntsb.gov/ntsb/brief2.asp?ev_id=...X94FA323&akey=1and the NTSB knows there can be a problem this aircrArticle: We have seriously seen surrounding the world many Lockheed C-130 Aircraft, which have had problems over the last five years. Many of these water craft have… 2. Monkey Brains Summary: In the first round of testing with the higher numbers, both monkeys who had been trained to respond in ascending numerical order arranged the new numbers correctly 75 per cent of the time.Later on, after tests where the answers were positively reinforced, all three monkeys responded correctly at a level above chance guessing.Dr. Terrace says, 'The results of these experiments provide compelling evidence that number is a meaningful dimension for rhesus monkeys.'It's not unusual that test… 3. Let's Get Dirty By Vernon Stent Summary: Although it is surely ok to have a few germs lying around in order to keep up our immunity it is not acceptable to knowingly pass germs on to others, especially if you work in a food factory of public kitchen. Arkay Hygiene exclusively sells Insect-o-Cutor fly killers (or 'Insectocutors') at their web site at eeeee.co.uk.So, perhaps it's just aArticle: There is no right way of saying this, so I’ll say it the wrong way: in order to stay healthy we must stay dirty. Now, that didn’t sound… 4. Galactic Mystery - Matter - On the Dark Side Summary: Further, about a quarter of the universe is made up of the ubiquitous dark matter with the rest of the cosmos being filled with the even more bizarre dark energy. Thus, the simplest way to explain this galactic mystery of insufficient mass is to hypothesize a non-detectable type of mass known as dark matter which can be the cause for the gravitational effects. As more and more data is collected on these and other aspects of the universe, formulae and cosmological postulates are generate… |
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