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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. The Harmonic By Robert Baird Summary: Cathie deals with a little of Tesla in the next work that is also researchable in Christopher Dunn's book titled Giza Power Plant.'The whole system acted as a gigantic electrical pump, and enabled Tesla to cause massive discharges of energy to oscillate between the earth and the surrounding atmosphere. This would tune the transmitter in harmoArticle: The HarmonicIn a good history book by a leading light in the field of history, I recall Michael Grant saying Pythagoras was ‘weird’. This… 2. A cluster of atoms Summary: In addition, the aluminium cluster can react with halogens to form halogen compounds with novel properties!However a cluster of one more aluminium atom, that is to say, 14 aluminium atoms, will act not like a halogen but rather like an alkaline earth (calcium, barium, etc) atom. For instance, when the 14 aluminium atom cluster reacts with 3 iodine atoms, an ion with an absolute charge of '3 is formed. Article:Imagine a new variety of compounds; compounds that have properties never seen … 3. EU's resistance to GMOs hurts the poor Summary:By James Wachai The bitter dispute between the U.S., Canada, and Argentina, on one hand, and the European Union (EU), on the other, over the latter's restrictive policies towards genetically modified foods reaches what is likely to be an acrimonious peak this week when the World Trade Organization (WTO) rules if the EU has violated trade rules by blocking foods produced using modern biotechnology techniques. EU's ban on GMOs has exasperated the U.S., Canada and Argentina - leading gro… 4. Feb. 12 is "Darwin Day" -- Secular Americans Celebrate B'day of Evolution Champ Summary: 'If people had a better understanding of both we wouldn't be embarrassed in front of the rest of the world by cases such as the one currently going on in Dover, Pa., where administrators are walking around local classrooms talking about 'intelligent design' and other nonsense,' he said.Pigliucci's course on 'Evolution, Creationism and the Nature of Science' is available at the Continuum of Humanist Education, the online school of the Institute for Humanist Studies.Though an unofficial h… |
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