light

One of those things that enters your mind while you wait to fall asleep: The speed of light is 186,000 miles per second in a vaccuum. It slows down when it enters another medium (if a vaccuum can be called a medium), such as a lens, a copper wire, whatever. The deceleration is essentially...

My partner and I have bought a sensor light, the sort that comes on when it's dark and movement is detected, then switches itself off 30 seconds after everything is still again. The cheapo batteries that came with it lasted around three weeks, which isn't bad, but when we tried rechargeables in...

we should learn from the past. people thought flying in machines were imposible just because it seemed so. Fact is, the light travels from one point to another. It is just speed, no matter what you think. The speed of light just seems to be the Fastest there is. using the speed of light as a...

If it is impossible to travel faster then the speed of light, then it must also be impossible to travel faster than half the speed of light because of the following . . . If A travels away from “static” position B faster than half the speed of light, and C travels away from B faster than half...

Has anybody heard of this?: http://www.physorg.com/news10789.html Would be nifty if true. Any opinions on the subject?

Light powered nanomotor: http://www.physorg.com/news10198.html

If the speed of light is constant, regardless of whether it is being emitted from an object that is moving toward or away from an observer, I don‘t see how motion can have a Doppler effect on light as in the expanding universe theory. In other words, how can something that is not effected by...

Does observed and measured relativistic length contraction occur instantaneoulsy along the entire length or does the contraction propagate at the speed of light? I ask in light of the following scenario. If one begins to travel at some everyday velocity towards some distant object (e.g.; the...

From the lights perspective that is. I'm wondering because as far as GR goes, the closer we get to light speed, the slower time will pass for us. It will take an infinite amount of time or mass for us to reach light speed. For some reason that makes me think that moving at the speed of light...

I'm looking at the Scole, um, 'experiment', and I can see how some of the effects may have been done. But I'm not sure how they did the light phenomena: http://www.esalenctr.org/display/confpage.cfm?confid=9&pageid=91&pgtype=1 Does anyone have any idea how they might have done it? Specifically...

OK, so I get most of the approaching speed of light marlarky. But as you approach the speed of light, your mass increases right? Ok just past Pluto, there is planet X. It is traveling at roughly 0.8 c relative to Earth. That's quite fast. Now an intrepid space travelling guy launches his ship...

Does it have to do something with their temperature ? Why do they usually go out the exact moment you turn them on ?

I recently read a description and response of a possible faster than light scenario. A bird flies overhead and you watch the shadow on the ground, as the bird flies over a wall the shadow moves faster vertically than it did on the flat. So if the bird was travelling at the speed of light, the...

How many different ways are there to bend light? By bending, I mean either bend sharply at an angle or bend gradually (curve). I have a reason for asking this but I want to be sure I'm not missing anything. Thanks for any contributions. BillyJoe

This came to mind while reading through the posts on the sound/light thread. Why 186,000 mps? Why not some lesser or higher amount? Or, why not no speed at all...where the light instantly gets form point a to point b? What did God have in mind that he 'knew' that it had to be this way, or...

What if the speed of sound were equal to the speed of light? What would go haywire? How would things be different? Echos? Sonic booms?

...pierces the darkness. It's refreshing to read this sort of article. Sort of like a pat on the back for a job well done. And I didn't even do anything! ETA: Intended conclusion to title. Oops.

Ok, I have a question that I hope makes sense, and have been unable to answer on my own. I consider my knowledge of general science to be a bit above average (not saying much considering the average American's grip of the subject) but I recently came across something that is more than a bit...

Ok, I strap on a rocket and slowly accelerate towards the speed of light. Of course, assume I don't accelerate so fast that my skin is torn off and thrown around like confetti. If you're wondering how I'll eat and breathe and other science facts, repeat to yourself "It's just a question, I...

The following article comes from here: http://gadgets.engadget.com/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Canadian “scientist” says “God Light” cures cancer > When we last checked in on Canadian mad scientist Troy Hurtubise, his Angel Light — a homebrew device that he said could see...

My bro found this online https://www.lightrelief.com/order.php I saw a customer service link, so I decided to try to talk to a representative. Here's the transcript of our discussion (Dave is a pseudonym): Dave: What types of ailments does this work with? You are now speaking with...

Some time ago, a 60W light bulb in a table lamp in my living room blew. This was not the first time this had happened, but previously I'd just put in a new bulb and everything was fine. This time, no joy. I eventually realised that the 3A fuse in the plug had blown at the same time. I...

I have seen many skeptics claim there is no evidence of psi, when there is - there is some debate about it, but there is plenty of evidence. I am starting to think that some people are simply not able to see somethings. I know of skeptics who have bent spoon bowls in the same manner as pk...

http://spaceweather.com/ Heads up folks! Catch it while you can! Edited to add cool map showing how far visibility extends: http://www.sec.noaa.gov/pmap/pmapN.html

http://www.hrcberkeley.org/ The big pdf file is a bit of a pain, but the report on slavery is worth it. http://www.hrcberkeley.org/download/hiddenslaves_report.pdf

http://rinkworks.com/bookaminute/ Ok, really condenced versions...amusing.

When I was young, it used to be said that reading in dim light was damaging to the eyes. However, I think that some years ago I saw this belief classed as an urban legend, but when asked to provide proof for it, I could not find it, not even with google. Can somebody confirm or reject that it...

I found this site quite funny so just had to share it. http://www.spectrahue.com/ Here it explains why it works on animals: :D Also look at those absurd prices, for a flashlight and three videos: http://www.spectrahue.com/products.htm

Worldwide maps Spot the gas flares over the North Sea:

If you were in deep space in your space craft and there were no nearby planets or suns etc, only stars many light years away, and you had to take a space walk, could you see your own hand in front of your face? Could you see your space ship if there were no lights anywhere on it? Is it...