Light Science... (Page 2) Evelyn99: The light it self is just leftovers energy from the sun for example. All you need is some sunscreen. Why a sun is a sun is becouse it’s big big enough that the gravitational force squeezes the senter and then a nuclear fusion takes place. Hydrogen atoms get squeezed together and become helium atoms. But for every helium atom made there is some leftover energy and it’s that enough that makes the sun nice and warm and releases sun rays. One day our sun will run out of hydrogen atoms and will need even more gravity in attempting squeezing helium atoms to even heavier elements. Our sun can’t do that so then it will die and become what we call a white draft that doesn’t shine. Some of the sun will explode in a attempt to keep fusion going. Big stars they burn there fuel much faster but when they run out of helium they have the gravitational force to burn helium into some bigger elements. But they too have a limit and when that limit is due they explode massively we call that a supernova and in that explanation temperatures get extremely high and it’s in this short window elements like carbon and other once gold are created. Iron much of the elements needed for life. Like you are elements made just there. Carbon is the key element in life life wouldn’t be in this universe if it wasn’t for those big stars that live fast and blow up. Guess that’s why we refer to famous actors and musicians as stars? Evelyn99: Light can have different wave lingth and the wave lingth will give the light some different energy levels. Like X-ray is one example. Same stuff just different wavelengths. Radio waves same thing but on the weaker side of the scale. Gamma rays are just the same but their wavelength makes them really powerful you wouldn’t take a solarium with gamma rays. briansmythe: Yeah it just seems a bit much to claim were finally got thr answers . Mand kind has been saying that for hundreds of years someone always comes up with something new . Then it all changes agin (Post deleted by Blackshoes ) Evelyn99: Well light will stop when it hits something like a wall. Depending on what kinda wave it is. Like X-ray has more easy than regular light waves to penetrate something even if it’s made up of the same thing. Gamma rays can really penetrate a lot but still only the wave light that is different. Light don’t speed up in vacuum but rather slow down inside the atmosphere because it’s so dens. If you reflect light on a mirror you probably charge the direction but never the speed. Specially when going to vacuum time standing still for the photon. Relative to anything else really.,light travel at 187000 miles pr second and that’s seems to be the speed limit as it’s don’t matter if you derive your car a 100 miles a hour with the lights on and I’m standing still with my light on. You would think that your light would travel light speed + 100 miles per hour but it is well proven that light has that same speed regardless of the observer. How is that possible? Will space dialation and space contraction. It’s not a static universe that just have space empty space serves a pourpus and can curve contract and even dialate.,time can even go backwards Corwin: A car traveling at 100 mph with its headlights on does not dilate the space/time in front of it. Rather the car headlights speeding towards you would have the light wavelength compressing to maintain the same speed and shift slightly towards blue in the visible spectrum. A car speeding away from you in reverse with its headlights on would shift the light wavelength toward the red part of the spectrum as the wavelength stretches. This is known as "Red-Shift" and "Blue-Shift". (Edited by Corwin) Evelyn99: That’s right you can use the same principle to figure out if a star is moving away or not. But all light are photos and the speed light gets to you is the same for red shift or blue shift. Yeah perhaps the wave changes but the speed remains Evelyn99: I’m not sure I’m not a a person with a education in physics just using my imagination. Car headlights? Mine doesn’t change anything I need New once arnym: Evelyn said "I’m not a a person with an education in physics just using my imagination." I think Einstein himself would have said the same. What may be missing in some of these - very interesting - discussions is recognition that we're talking about theories; as in the theory of relativity. These theories are simply attempts to explain what we observe in terms that let us predict and manipulate physical processes. If our theories let us do that successfully we think of them as sets of facts, but they may not be factual at all; maybe just useful ways of thinking about things. Evelyn99: Well I do like to read books so some knowledge isn’t imagination but according to my parents I’m born with a strange ability to visualize imagine and I have a great fantasy. Personally I don’t know arnym: y're welcome, but by the way I include book-learning in my concept of 'anecdotal' (as distinct from direct) evidence. Evelyn99: The sun is like a huge atom reactor. Generally full of hydrogen atoms but because of strong gravitational force as suns have a lot of mass it gets really hot specially inside so hot that it fuses hydrogen atoms into helium atoms. While doing that there is some leftover energy because two hydrogen atoms is little much to make a helium atom that lefteover energy keeps the suns hot and sending out photons light waves down here and elsewhere Evelyn99: And they goes in waves but remember that different types of light like gamma rays have different wave lights | Science Chat Room 1 Person Chatting Similar Conversations |