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SciFi movies and pathetic misconceptions of tech failing for the story line.
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coppice:

--- Quote from: Kim Christensen on April 18, 2023, 10:34:38 pm ---
--- Quote from: tszaboo on April 18, 2023, 10:03:59 pm ---So if you just burn radial out, this doesn't work at all, and you fall back to earth, quite fast.
--- End quote ---
You can, if you reach escape velocity, then you won't fall back to Earth. Less than escape velocity, then yes, you'll fall back.

--- End quote ---
You only need to reach a large escape velocity if you want to shut off your engines pretty quickly and never fall back to Earth. If you had the technology to keep your engines going for an extremely long time you could just keep moving gently away from the Earth until its pull on you drops to a value low enough that your modest speed exceeds the much reduced escape velocity at the distance you have achieved. The reason we don't do that is the most efficient way we have to leave the Earth is to get as close to a ballistic launch as possible. i.e. build up speed as fast as we can, and coast.
rdl:

--- Quote ---I think your decimal point is in the wrong place.
--- End quote ---

Oops. My bad,  I was doing everything in km/sec
AndyBeez:
Another one to stir the sci-fi pot.

Why do time machines always hold station? That is, they always arrive at exactly the same geodetic location in the past, present and future. Never the true motion of the earth's rotation, orbit, transit and the associated perturbations are taken into consideration. Not even tectonic and erosional elements either.

Marty McFly travelling back to 1955 from 1985 would have arrived ... in the middle of space due to the true motion of the sun around the galaxy. A mere 218 billion kilometres (1457AU) from Hill Valley.
coppice:

--- Quote from: AndyBeez on April 19, 2023, 02:26:40 pm ---Another one to stir the sci-fi pot.

Why do time machines always hold station? That is, they always arrive at exactly the same geodetic location in the past, present and future. Never the true motion of the earth's rotation, orbit, transit and the associated perturbations are taken into consideration. Not even tectonic and erosional elements either.

Marty McFly travelling back to 1955 from 1985 would have arrived ... in the middle of space due to the true motion of the sun around the galaxy. A mere 218 billion kilometres (1457AU) from Hill Valley.

--- End quote ---
Its incredibly hard to make a story flow if you are going to be accurate. Its would be tool long, and too complex. You just have to give the author some licence. How much is appropriate depends on the nature of the tale. For something like Back To The Moneymaking its supposed to be fun, not accurate. I'm much more OK with him jumping to a point on the Earth than with his parents fading away instead of just vanishing as the time lines are supposed to be changing.
Kim Christensen:

--- Quote from: AndyBeez on April 19, 2023, 02:26:40 pm ---Marty McFly travelling back to 1955 from 1985 would have arrived ... in the middle of space due to the true motion of the sun around the galaxy. A mere 218 billion kilometres (1457AU) from Hill Valley.

--- End quote ---

They always talked about the flux capacitor which allowed them to move through time. They forgot to mention the flux inductor, which when paired with the flux capacitor, allowed them to move through both space and time in resonance with the universe.  :-DD
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