speed of light

(Phys.org) —Physicist James Franson of the University of Maryland has captured the attention of the physics community by posting an article to the peer-reviewed New Journal of Physics in which he claims to have found evidence that suggests the speed of light as described by the theory of...

Hi all, Yesterday an idea sprang into my mind, while i was lurking through the NASA sites. Hubble detected several very distant galaxies and supernovae in a distance between 8 and 12 billion lightyears and that raised the following question in my mind: According to NASA, at least one of these...

http://www.bbc.co.uk/news/science-environment-15017484

A laser in space fires one second long beams of light at one second intervals. You are 10 light seconds away from the laser and you receive the beams of light 10 seconds after they were emitted and measure them to be one second long with one second intervals. You then travel toward the laser at...

Hello, I am a long-time fan of Mr. Randi but new to posting on these forums. In fact, it's my first time so please be gentle. Anyways, I have a question that some of you critical thinkers might be able to help me with: If the universe is about 156 billion light-years across (NASA.com), would...

If not - Why not? If so - How can it travel at all relative to an observer, let alone travel at c?

has or is the speed of light a constant? Has the speed of light slowed down any since the big bang? And finally is there a formula that shows the rate of speed decrease of light over time? Thanks in advanced.

I was talking about planck length and planck time with a friend a few days ago(after stumbling over it here in the "what is the definiton for a moment and an instance" thread). Because i marveled at the concept behind those units. As far as i can see both units would be universal(and should we...