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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. Megaliths and Pole Flips Summary: The changes in the earth magnetic field away from the 7.8 cycle rhythm that it has been for a long time is something that may be a result of the things man has done to the Earth. It is an exciting era and the opportunity to GROW has never been greater. 'Scientists have long known that certain minerals in molten rock, as they cool, become magnetized by the Earth's magnetic field, and are aligned with the planet's north and south magnetic poles. Likewise the hardened rock: unless the rock… 2. Earth Core Spin Cycle for Geo Thermal Launching of Rockets into Space By Lance Winslow Summary: Since the core moves faster and is not round and since the cavity in the Earth's center is most likely not symmetrical, it stands to reason that as the lumps or bumps in the Earth's core comes around, it will effect the inside cavity as it bumps, causes friction or scrapes the inside of the Earth's center cavity, which is said to be filled with very hArticle: We know that the this pendent world is not completely round, by observing the terrain and measuring the sphincter at the equator… 3. Medical Miracle or Mistake? By C. Bailey-Lloyd Summary: Fundamental elements of life and the aspects of cloning bring dramatic advancement to the scientific and medical community; however, is this fast-paced artificial reproduction an intrusion of Nature or a doorway to infinite, medical cures?In lieu of scientific developments in the biological mainstream, the human intervention of life and it's natural stateArticle: Fundamental elements of life and the aspects of cloning bring forth dramatic blossoming to the scientific and medical commu… 4. Scientists Declaration about The Holy Quran and Islam-Dr. Maurice Bucaille Summary: His work, 'Mummies of the Pharaohs - Modern Medical Investigations' (St. Martins Press, 1990), won a History Prize from the Acad'e Fran'se and another prize from the French National Academy of Medicine.His other works include: 'What is the Origin of Man' (Seghers, 1988), 'Moses and Pharaoh, the Hebrews in Egypt', (NTT Mediascope Inc, 1994); Article:He is the institute of a best-seller, 'The Bible, The Qur'ân and Science' (1976). His arrant studies of the scriptural languages, including … |
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