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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. Moon Phase Lesson Plan For Elementary-Age Students By David Rose Summary: Some concepts of teaching about the moon phases will be reviewed here.First, you should help the children understand moon phase activity (the cycle of the moon), which is divided into 4 parts: new moon (where you see no moon at all), first quarter (only half of the moon can be seen), third quarter (only half of the moon can be seen), and full moon (the entireArticle: Understanding the phases of the moon can be a tricky concept for a tad in elementary school. There are many different as… 2. 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… 3. Confusing MAV Optic Flow Sensors In flight Using Mobiles By Lance Winslow Summary: Using Shapes on Mobiles to confuse optic flow sensors in Micro Air Vehicles appears to be feasible. By using the optical flow sensors a new technology of mind boggling proportions the tiny MAV would take send out pulses and capture images, as the next pulse sees the image again it is bigger, this way the tiny MAV can sense when it is really big and getting closeArticle: Using Shapes on Mobiles to confuse optic flow sensors in Micro Air Vehicles appears to be feasible. Today we are stu… 4. That Dust on Your Car May Soon Be Smarter Than You Think? By Lance Winslow Summary: So perhaps the thought of making dust is actually a very noble step for mankind indeed.A piece of smart dust as the foundation. This will work or a variation on this idea could work?Other ideas have been thrown out as well a polymer bubble with a small micro-mechanical device inside.Another thought I had was a piece of NASA foam which had a micrArticle: Here is a thought to get this topic started. A thought on a smart dust design. The smart dust will have to be able to stay for long e… |
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