Timeline for Alcubierre Drive without FTL?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 13, 2020 at 17:33 | comment | added | Christopher James Huff | It should be obvious, but spacecraft do not need to be held together with gravity. As for time dilation, nothing at that link supports your claims. There is no evidence that time dilation on the ISS is having any effect on the crew, and there is nothing in known physics or biology to make us think that such effects are possible. | |
| May 13, 2020 at 16:19 | comment | added | Justin Thyme the Second | @Christopher James Huff You do not need earth-like, you only need enough gravity to hold the rock together, and to keep things from leaving the surface. And your statistics from ISS only serve to demonstrate how just very, very small changes in space/time affect humans, so just imagine what happens when you scale it up to 0.3 c No crew has been on ISS for the entire 21 years. And yes there have been effects that are certainly non-negligible. science.sciencemag.org/content/364/6436/eaau8650 | |
| May 13, 2020 at 13:46 | comment | added | Christopher James Huff | As for gravity, asteroids will have asteroid levels of gravity. The biggest asteroid in the solar system, Ceres, has a surface gravity of only 0.029 g...there isn't enough mass in the Belt to create an object with anything close to Earthlike gravity. And of course, people will be living inside generation ships where the gravitation is even weaker, not on their surfaces. The crew of generation ships will either use centrifugal "gravity" or be adapted for lifetime microgravity. | |
| May 13, 2020 at 13:45 | comment | added | Christopher James Huff | I don't know where you got the idea that the ISS crew is experiencing anything unusual due to time dilation, but the notion is completely false. The oldest part of the ISS has experienced about 0.15 s less time than the surface of Earth after 21+ years in orbit. There is no perceptible or measurable effect on the crew. | |
| May 13, 2020 at 13:03 | comment | added | Justin Thyme the Second | @Christopher James Huff Of course there is no evidence for it. Humans have never experienced it, so there CAN be no evidence. On the other hand, there is absolutely no evidence that humans CAN handle time dilation. In fact, even the slight time dilation effects from the long-term residents of ISIS show definite psychological and physical effects, some which are explainable, and many of which do not match control groups in isolation on earth, Yes, I AM talking ships as massive as asteroids - generation ships holding 50,000 plus people. Don't you read generation ship sci-fi? | |
| May 13, 2020 at 11:41 | comment | added | Christopher James Huff | There isn't the slightest shred of evidence that there would be psychological issues making it impossible to deal with time dilation, and the suggestion is absurd...humans are not so inflexible and incapable of adaptation. As for the notion of using mass to provide gravity...you clearly have no conception of the scales involved. You are talking about making ships as massive as planets. Nobody is going to do that when they could just build a rotating section for quintillions of times less mass. | |
| May 13, 2020 at 3:53 | comment | added | Justin Thyme the Second | @ Christopher James Huff So you calculate the gravity of your ship, that will provide a given gravitational pull, in place of artificial gravity, sufficient to 'hold you down' at the beginning of your trip. You use half of your mass as reactionary mass. Now suddenly you are floating. Gravity DOES matter, when you use up most of your mass as reactionary mass. It also matters for inertial dampening on those sudden turns. | |
| May 13, 2020 at 3:19 | comment | added | Justin Thyme the Second | @or1426 The problem is the psychological mind conflict. You are SUPPOSED to be as old as your twin brother. Everything about your existence, about human history, culture, biology, says that is so. Even you body says that is so. Can lie REALLY handle not being as old as the biological twin back on earth? Lots of evidence says not, no matter how loudly 'relativity' proclaims other wise. | |
| May 12, 2020 at 17:07 | comment | added | Tim McClelland | Yes, starship designs that are basically giant tanks of reaction mass with a tiny crew compartment attached somewhere aren't that appealing, even if they might be more realistic. | |
| May 12, 2020 at 12:09 | comment | added | Christopher James Huff | What or1426 said, and the Alcubierre drive doesn't somehow avoid time dilation in the first place. And the energy requirements are still enormous for sublight speeds. And the gravity of the ship is utterly irrelevant unless you're warping planets around. And what do particle colliders have to do with anything? | |
| May 12, 2020 at 9:34 | comment | added | or1426 | As far as your second paragraph goes, assuming special/general relativity are roughly correct then there can be no physiological effects resulting from relativistic travel. Every observer is able to claim to be at rest, indeed every observer is at rest in their own frame of reference. | |
| May 12, 2020 at 2:10 | history | edited | Justin Thyme the Second | CC BY-SA 4.0 |
added 124 characters in body
|
| May 12, 2020 at 2:05 | history | answered | Justin Thyme the Second | CC BY-SA 4.0 |