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51 votes

What parts of a spaceship would still work 100 million years later?

Time is relative. You may simply assume that the spaceship flew close to the speed of light (relative to the planets your people are living on) through a rather empty part of the universe (so it won't ...
KGM's user avatar
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37 votes

What can be used as a galaxy-wide time reference?

galaxy-spanning time reference Nothing These kinds of things work on Earth because anyone's relative speed to anyone else does not reach a considerable fraction of the speed of causality ($c$). ...
The Square-Cube Law's user avatar
32 votes

How can I penalize using accelerated time in Full Dive Virtual Reality?

Brains can simply not function that fast. To process that much information your brain requires rest (AlexP elaborates on this in their comment: to retain information, the short-term memory needs to be ...
Joachim's user avatar
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29 votes
Accepted

How long would it take for nature to reclaim a completely abandoned city?

When we speak of Mediterranean climate, the archetypal location is of course the Mediterranean Sea. The shores of the Mediterranean and of the Black Sea are positively full of ruins (or sometimes not-...
AlexP's user avatar
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20 votes

How long would it take for nature to reclaim a completely abandoned city?

Stone and clay buildings will be visible for 1000 years or so, after that, it slowly becomes a mound. Stone and clay buildings will be visible and recognizable for centuries, but will slowly get ...
sinanonline's user avatar
19 votes

Running out of time in a world where time has stopped, how to make it consistent?

The matter does clip, but it's not an instant-kill Stuck Buck will have a door materialised in his body, but there's plenty of space between the atoms, this doesn't violate laws of physics just yet. ...
KeizerHarm's user avatar
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18 votes

How can I penalize using accelerated time in Full Dive Virtual Reality?

Brains produce degradation products while working. They use up sugar, they produce heat, they produce waste-products, that are transported away by cerebro spinal fluids at night. These byproducts are ...
Pica's user avatar
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15 votes

Is it reasonable to use the rate of radioactive decay as a new way of measuring time

It depends on the span of time you wish to measure. To measure a short/human scale time, you may struggle due to the inaccuracies inherent in decay. But if you want to measure 'oh, it happened 10 ...
sdfgeoff's user avatar
  • 7,715
15 votes

Universal Graphical Representation of a specific moment in time

Put a clock on it. You can do pretty well pretty easily if you put a lump of metal in a box and some pictograms to tell the aliens what isotope was in the box when you launched it. The aliens can ...
g s's user avatar
  • 7,257
14 votes

What parts of a spaceship would still work 100 million years later?

100 million years? I think the spacecraft would be non-existent. Why? So, the primary drivers of corrosion are oxygen and water - and okay these don't exist in space... But let's consider the 2 ...
TheDemonLord's user avatar
  • 27.1k
14 votes

Running out of time in a world where time has stopped, how to make it consistent?

The whole idea is delightfully silly, and like any good sci-fi B movie, it requires the reader to take out their brain, with everything they know about science, and just leave it on the coffee table ...
Dewi Morgan's user avatar
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13 votes

Running out of time in a world where time has stopped, how to make it consistent?

Nothing happens... honestly, nothing You've set a rule for your world: people moving through the timeless condition push atomic objects out of the way without regard to inertia, energy, or anything ...
JBH's user avatar
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13 votes
Accepted

What parts of a spaceship would still work 100 million years later?

I think almost all of the spaceship will survive. If it is travelling for a hundred million years at 1% of light speed it can get half the way to the Andromeda galaxy. Most of its flight will be spent ...
Richard Kirk's user avatar
  • 9,519
10 votes

How long would it take for nature to reclaim a completely abandoned city?

Location, location, location It seems plausible that a city could remain recognizable as such after a 1000 years, depending on building materials and location. For materials, Stone is good, wood is ...
N Brouwer's user avatar
  • 316
9 votes

What parts of a spaceship would still work 100 million years later?

Earth is a spaceship, isn't it? As far as we know, it works pretty well and it is already well past 100 million years of age. In short, if intended, the spaceship can be made to survive this long. It ...
fraxinus's user avatar
  • 6,547
9 votes

how early can people build a giant clock?

My answer would be the second century BC. The Ptolemaic model of the motion of the planets does not necessarily mean the inventors believed that the planets ran on gears and wheels. Some believe that ...
Richard Kirk's user avatar
  • 9,519
9 votes

How can I penalize using accelerated time in Full Dive Virtual Reality?

You rely 100% on very fictiony Sci-Fi universes as a baseline Why (or better how) on earth would a regular human brain be capable of handling several days worth of information in a few minutes? ...
Hobbamok's user avatar
  • 4,342
9 votes

How can I penalize using accelerated time in Full Dive Virtual Reality?

Super Speed does not mean you do things faster ... at least not from your own perspective. Hand waving away the obvious problem that such a simulator would probably fry your brain, the only way one ...
Nosajimiki's user avatar
  • 95.1k
9 votes

Universal Graphical Representation of a specific moment in time

Pioneer already carries the information in its velocity. If the reader knows where it has come from using the pulsar map, then they can work out how long it took to get from there to here given the ...
Richard Kirk's user avatar
  • 9,519
8 votes

Is it reasonable to use the rate of radioactive decay as a new way of measuring time

Radioactive decay is nonlinear and the decay products will change the alpha detection rate. This will not work as an absolute measure because it’s not possible to measure just the radium decay, and ...
Vogon Poet's user avatar
  • 8,179
8 votes

What can be used as a galaxy-wide time reference?

Use Pulsars AND Novas MichaelK already pointed out the benefit of pulsars, but there is a second component to the problem that needs to be addressed. Just because everyone is counting the same number ...
Nosajimiki's user avatar
  • 95.1k
6 votes

how early can people build a giant clock?

Probably very early, given they have the know how, but you will have to accept some degree of inconsistency between different places. This is the the most simple design I could come think of: To ...
byMaelstromer's user avatar
6 votes

What can be used as a galaxy-wide time reference?

Galactic Coordinate Time Or TCG (from the French “Temps-coodonnée galactique”), which you will have to define. No, not GTC: that would be Galactic Coordinated Time, and “coordinated” time does not ...
Edgar Bonet's user avatar
5 votes

Running out of time in a world where time has stopped, how to make it consistent?

Same space, different time Einstein showed an important thing. Time and space are inextricably linked. It is part of a host of complex theories and ideas, but some are stil refreshingly simple. Object ...
Trioxidane's user avatar
  • 37.1k
5 votes

Running out of time in a world where time has stopped, how to make it consistent?

The simplest and most logical solution is for anything moved by a person in a time suit to simply stay put wherever the person in the time suit moved it to, or wherever it moved to under the influence ...
Monty Wild's user avatar
  • 61.9k
5 votes

What can be used as a galaxy-wide time reference?

UTC Step 1, convince everyone that using good old earth UTC is the way to go (this is the hard part. Then again, tradition dies hard..). Then send messages to everyone "it is now precisely 18:59:...
LazyLizard's user avatar
4 votes

What parts of a spaceship would still work 100 million years later?

Frame Challenge 1: You don't really need 100,000,000 years For the sake of your story, is there any particular reason that drives the number of 100 million? What you probably mean is "long enough ...
automaton's user avatar
  • 2,535
4 votes

What parts of a spaceship would still work 100 million years later?

No parts will survive 100 million years Others have mentioned micrometeors, radiation and thermal drift. But on such a long time-scales there is another issue: radioactive decay. It is practically ...
Negdo's user avatar
  • 2,323
4 votes

How can I penalize using accelerated time in Full Dive Virtual Reality?

People won't want to The question is, why don't people spend years on end studying without pause as is? Because they don't want to. Sure, "in real life" the time might not pass, but your VR ...
MarsMagnus's user avatar

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