Recent content by ko_kyi

I suspect what the "agreement" was in the question is "The path the photon ought to have taken" and my only point was that there wouldn't be agreement. There is no reason there should be, because the only way to agree would be to have Alice and Bob in the same inertial frame. I seem to...

I'm really not qualified to answer, but I think I understand the question. I would guess that the answer is that it does have a spatial position, but what the measurement of it is would depend upon where you measure it from, Alice, Bob, or a third observer, and each would be correct inside...

Doesn't this imply that the photon does not have a specific spatial position? No, to measure speed you must measure time. Photons travel only at light speed, so the variable factor is time, not photon velocity. When they have a motion relative to one another, their time is not the same as...

This is probably a really stupid question, but I don't know where else to ask it. I am a layman watching Science channel, the show "How the Universe Works" episode called Alien Galaxies. In it they described the large scale structure of the universe, and talked about the Sloan Wall, which is...

Equally physics uneducated as you are, but here is my understanding: There is no "space" without "time", there is "spacetime" - it's really one thing. Wherever you happen to be, you perceive distance and time as consistent, a yard is a yard, a second is a second. Gravity and any other...

I was watching a Discovery channel program about the future of our Sun (and any similar star). They were describing the expansion of the star as it goes to Red Giant stage, and how it would eventually expand to include Mercury. At first I thought that the molten planet would slow due to...

1. No, water conducts heat and can store more heat than air, so you would die in minutes in near-freezing water. Remember, when the Titanic sank, the people in the lifeboats survived, the people in the water died quickly. 2. In a closed system moving at a steady speed, everything in the...