jlivingstonsg

--- When I am on the other planet 100 light years from earth I can calculate what speed I had. You calculate distance divided by time to get speed. The distance between earth and the star system I am on is 100 light years. The time it took to travel was 9 years. 100/9 = about 10 light years per year Regards MagI --------

--- That is if they calculate the distance and the time when they travel close to speed of light. The shorter distance/travel time will be a speed slower that the speed of light and that is correct. But we are doing the calculation when they have arrived and an hour is the same as on earth. If they now just calculate the distance that is about 102 light years/9 years they get a travel speed about 10 times faster than the speed of light. Regards from Sweden MagI ------

---- If you travel close to the speed of light, then the time slow down in the spacecraft. So lets say you travel 100 light years to another star and our sun is beaming a photon beam to push it, so that the sun sail spacecraft accelerate at 1 g half the way. In this webpage it calculate a deacceleration the en half of the trip at the same 1 g. https://spacetravel.simhub.online/ (This can be done if we first send many solar sails to the stars that can deaccelerate our ship. These large reflectors can maybe be built to stand the heat and deaccelerate close to the star or something..... ) Set up the page like this and then click "Calculate" https://snipboard.io/XpW9Rb.jpg Then you get these numbers. https://snipboard.io/XQ You can see that from earth, the time to go to the star 100 lightyears away will in the earth timeframe take about 101,9 years to go to the star and from earth they will see that the ship move close to the speed of light around max 0,9998 % of the speed of light. On the ship the time slow down and you can see that in the timeframe for the astronauts, the trip will take about 9 years. So the astronauts can calculate their average speed is about 10 times faster than the speed of light in their timeframe. (They never moved faster than the speed of light but when you move so close to the speed of light, then the time slow down.) Regards from Sweden -------

--- I bet it is possible to develope this technology to make this work in 100 to 1000 years with artificial intelligens that have an IQ around 200 000 . We can not today even imagin what technology we will have in some hundred years. Because this is probably a strong candidate to get to other stars because we need speeds close to speed of light to slow down time to get to other stars in some years. The astronaut will be able to calculate his speed to be 10 to 20 times faster than the speed of light because of the time dilation in the spacecraft. MagI ----

...... Hi. What if we build hundreds of large solar reflectors that can then focus sunlight on a solar sail space craft. How many square miles of sun reflectors would be needed to accelerate a spacecraft at 1 g, on lets say 100 tons to 90% of the speed of light in lets say 3 years ? Regards from jlivingstonsg .....

---------------------------- In the element table is the left column with Hydrogen at the top, and column of metals. If you take any oxidized metal and melt it, you get the metal oxide in liquid form. The oxygen does not separate from this liquid form, if you dont add oxygen-reducing substances, that take the oxygen from the metal, to be able to get the pure metal. So if you, for example, melt iron rust you get a liquid metal oxid. Now...... If you google Hydrogen, there are discussions about whether Hydrogen is a metal or not. Is Hydrogen a metal or what is Hydrogen? If Hydrogen is a metal. Can one then say that water is a liquid metal oxide or a liquid metal rust ? MagI ------------------------------

... Hi. When I was at school 1989 we played a 3D Tetris game called BlockOut. I was best at school at a level called: Out of control. About 3 years ago I found BlockOut online and challenged students at universities and I am almost twice as good as the best at level: Out of control. I have always around 100 000 points at the level: Out of control. My question is Do I have a high spatial ability IQ or am I just good at the game BlockOut? Regards M.Sc. Magnus ......

I think it is interesting to ask if it is possible to detect with timing the photon, what surface it is reflected from. Has it or has it not been done? Link? MagI -

They have done this two reflection experiment with a thickness of up to one meter. See youtube Feynman video. So it should be possible to determine if the photon comes from the last surface. https://youtu.be/eLQ2atfqk2c?t=2457

Have anyone measured the time a photon take from emitting to detection do determine what surface it is reflected from? Both in one surface and with two surface reflection. Where is the photon reflected? Can the time of the photon be measured that accurately? Regards Magnus