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re: 3 Body Problem - Netflix
Posted on 3/27/24 at 12:37 pm to BOSCEAUX
Posted on 3/27/24 at 12:37 pm to BOSCEAUX
quote:
1. The nano-fiber sail ship. It needed a thousand nuclear detonations to reach 1% light speed correct? How would they have placed let’s say the last 200 or so warheads so far out so quick? At that point where the sail ship would be and how fast it was moving would have taken normal propulsion well over a decade to get there to put the warheads in place. Didn’t make sense to me.
They wound up only getting 300 warheads, which is why they had to reduce the mass of the capsule so much. That said, it’s an interesting question. Using some pretty big assumptions:
- Assuming ~17 km/s capsule velocity at the end of the conventional burn
- Assuming linear acceleration with each successive detonation
- Assuming the warheads are evenly spaced
- Assuming ~10 seconds between the first and second detonation
.. then the capsule’s velocity would increase at roughly 10 km/s with each detonation, putting it just over 1% speed of light after 300 detonations. After the first detonation it would be traveling at roughly 27 km/s, and would travel 270 km total between the first and second warhead. 270 km/warhead * 300 warheads = 81,000 km total travel distance.
That’s actually… not that far. Earth is 150 million km from the Sun. Using the same 17 km/s post-burn velocity for the warheads, it would only take about 80 minutes for one of them to travel 81,000 km. Of course, there are other considerations:
- The warheads have to decelerate, which will increase their travel time.
- The acceleration after each detonation probably isn’t linear. So the capsule velocity probably increases by more than 10 km/s after the first detonation.
- I didn’t rewatch the scene to check the time between the first two detonations.
I actually think the bigger technical issue would be the precision required to position each warhead in the exact location required to pass through the hole on the sail. I think a more realistic failure mechanism would have been a warhead that barely missed the hole and collapsed the sail rather than a failed cable connection.
quote:
Also the name of the show. Is that just a reference to 3 Suns in the system the aliens reside in?
It’s a reference to the classical physics problem that the San-Ti face as a civilization. There is no known mathematical solution for the movements of objects in a 3-body system, due to the chaotic way in which the gravitational fields interact. Here’s an image from Wikipedia that sort of illustrates the issue:
This post was edited on 3/27/24 at 10:03 pm
Posted on 3/27/24 at 1:02 pm to lostinbr
quote:
then the capsule’s velocity would increase at roughly 10 m/s with each detonation, putting it just over 1% speed of light after 300 detonations. After the first detonation it would be traveling at roughly 27 km/s, and would travel 270 km total between the first and second warhead. 270 km/warhead * 300 warheads = 81,000 km total travel distance.
Wouldn’t it be gaining speed after each explosion and covering more distance exponentially? The last 50 or so detonations would be much further apart if we are figuring 10 seconds in between detonations. Or the detonations if kept at the same distance apart would begin to be close to simultaneous.
Posted on 3/27/24 at 1:04 pm to lostinbr
quote:
It’s a reference to the classical physics problem that the San-Ti face as a civilization. There is no known mathematical solution for the movements of objects in a 3-body system, due to the chaotic way in which the gravitational fields interact. Here’s an image from Wikipedia that sort of illustrates the issue:
Thanks for the explanation. What exactly is the issue they are facing? Is the chaotic gravity going to eventually rip their planet apart?
quote:
actually think the bigger technical issue would be the precision required to position each warhead in the exact location required to pass through the hole on the sail. I think a more realistic failure mechanism would have been a warhead that barely missed the hole and collapsed the sail rather than a failed cable connection.
Agree. Like she said threading a needle 300 times.
Posted on 3/27/24 at 3:07 pm to lostinbr
quote:
I actually think the bigger technical issue would be the precision required to position each warhead in the exact location required to pass through the hole on the sail
And why does any of the technical issues even matter? The aliens said they wanted to meet this frozen brain. So the plan was to stop the probe traveling really damn fast, clone his body, revive his brain. That is not problem. Piece of cake.
Why couldn’t they just help guide the probe where it needed to go? That would seem like the easiest part of everything that needed to happen to meet Will’s brain.
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