Yes it does. Light on Mars will not stimulate the photoreceptors in your eyes on Earth.Clay Gillespie said:Light doesn’t have to travel from there to here to be seen.
This is all wrong. First of all, you can't "watch" the radio waves travel. Once the radio signal you sent to the craft has left Earth, it is propagating through space and is not visible to you. 13 minutes after you sent the signal, it will arrive at your craft, the light will come on, and the light will begin propagating back towards earth. 13 minutes after this (26 minutes after you sent you radio signal), the light will arrive at your telescope and you will see the light come on.Clay Gillespie said:Let’s say I’ve make my radio waves visible and am watching them travel toward my craft and then be absorbed into its radio dish. Viola, light comes on, visible to me looking through my telescope. Or else your saying my little old craft light sends light in the form of photons in every direction, and I have to wait for the speed of that emmination to report photons to my telescope. Now let’s say in that radio transmission I instructed the light to stay on for 30 seconds. Now the source of that emanation is out. You will see that light come on thirteen minutes after broadcast the and it will remain on for 30 seconds.
Easy, We’re seeing what is there not what light is reporting. The relatively small light from the craft will illuminate a small circle area of space, but that light will never reach earth, but it is there, and we can see it’s there.gmax137 said:Why do you think it takes 13 minutes for the craft to see the radio waves but no time for us to see the returning light?
That's right, you have to wait.... and I have to wait for the speed of that emmination to report photons to my telescope.
No, you will see it come on 26 minutes after your broadcast.Now let’s say in that radio transmission I instructed the light to stay on for 30 seconds. Now the source of that emanation is out. You will see that light come on thirteen minutes after broadcast
Rightthe and it will remain on for 30 seconds.
You're very confused. What do you think "seeing" is? It is light entering your eyes, which your brain then interprets.Clay Gillespie said:Easy, We’re seeing what is there not what light is reporting.
This is just wrong.Clay Gillespie said:Easy, We’re seeing what is there not what light is reporting.
That is just it. You cannot see light traveling toward the craft. Let's say that we are using visible lasers instead of radios, so that there is no issue about the visibility of the wavelength. Laser light traveling away from you is not visible.Clay Gillespie said:Let’s say I’ve make my radio waves visible and am watching them travel toward my craft
Never. There are three events happening in the obvious chronological order:Clay Gillespie said:When do you think it slipped into the past?
Ibix said:If the craft is 13 light minutes away, the time between pulse emission and echo reception will be 26 minutes. We've done this experiment. It's usually called "radar" and is extremely well understood.
Your image of it was always in the past. When it was sitting on the launch pad and you were, let's say, 1km away, what you were seeing was the rocket as it was 3 microseconds ago. As it recedes from you, what you see is an image of the rocket that is increasingly delayed from your present moment.Clay Gillespie said:Alright I try another tact, I watched my craft launch by telescope and never took my eyes off it and have been charting how long it takes radio wave broadcasts to turn lights on the craft on. I know the radio goes from here to there and can gauge how far away the craft is by measuring that. Mind you I’ve never taken my eyes off it. When do you think it slipped into the past?
Twenty six minutes after the pulse emission and thirteen minutes after the reflection you will be able to see any reaction the craft has to receiving the pulse. Not before. Again, we have done this. We've done it with visible light (since more than a century ago) and radio waves, and it does not work the way you appear to be describing.Clay Gillespie said:Yes, the radio wave has to go from here to there (target) and the report time tells distance, one cycle, repeat get velocity. But what your looking at is there, visible, and being bounced off.
That’s actually not reality. I can right now send that signal to a craft around Mars, knowing how long my transmission takes to get from here to there, and see it come on instantly. If the transmission takes thirteen minutes and the instruction is turn on X light, it is instantly visible after thirteen minutes.Nugatory said:Never. There are three events happening in the obvious chronological order:
1) First, radio signal leaves earth;
2) 13 minutes after #1, radio signal reaches ship and turns light on so light signal leaves ship;
3) 13 minutes after #2 light from ship reaches your telescope so you see it.
Both the visible light and the radio waves are electromagnetic radiation traveling at speed ##c, so it takes 13 minutes for the radio waves to travel from Earth to ship, and 13 minutes after the light turns on for the light to travel back to earth. The same thing would happen if the radio receiver and the light were in the same rom as you, just a meter or so away - the only difference is that light travels so quickly that we don’t notice the few nanoseconds of time difference between when something happens across the room and when we see it.
The situation you’re describing is equivalent to shining a laser at a mirror on the ship and timing how long it takes for the reflected light to get back to you.
Why do you keep making wrong statements? What you are saying is simply wrong, and we have centuries of experience to prove it. Are you just trolling?Clay Gillespie said:That’s actually not reality. I can right now send that signal to a craft around Mars, knowing how long my transmission takes to get from here to there, and see it come on instantly. If the transmission takes thirteen minutes and the instruction is turn on X light, it is instantly visible after thirteen minutes.
Yes it is. We've done it. You are wrong.Clay Gillespie said:That’s actually not reality.
A thought experiment about light speed is a hypothetical scenario that explores the implications of objects moving at the speed of light. It is a mental exercise used to understand the fundamental principles of physics and to test theories about the nature of light and its behavior.
According to Einstein's theory of relativity, objects with mass cannot reach the speed of light. As an object approaches the speed of light, its mass increases infinitely and it would require an infinite amount of energy to accelerate it to that speed. This is why the speed of light is considered to be the universal speed limit.
Time dilation is a phenomenon that occurs when an object is moving at high speeds. As an object approaches the speed of light, time slows down for that object relative to an observer. This means that time would appear to pass slower for an object moving at the speed of light compared to an object at rest.
As mentioned earlier, the mass of an object increases infinitely as it approaches the speed of light. This is due to the relationship between mass, energy, and the speed of light in Einstein's famous equation, E=mc². Therefore, it is impossible for an object with mass to reach the speed of light.
Space-time is the four-dimensional framework in which all physical events occur. In a thought experiment about light speed, the concept of space-time is used to understand how objects moving at the speed of light would affect the fabric of space and time. It also helps explain phenomena such as time dilation and length contraction that occur at high speeds.