Ultimate space simulation software

 
A-L-E-X
Galaxy Architect
Galaxy Architect
Posts: 3498
Joined: 06 Mar 2017 20:19

Science and Astronomy Questions

18 Jan 2019 07:46

Ah no Wat, I meant to look at one's own past, sort of like a video recording of things that happened in the past, without the ability to change them.  That was in an Asimov short story.  The viewer was able to see events in history without being able to interact with or change history.

Wat, based on that, it sounds like using the special relativity speed method would be easier than trying to manufacture a source of gravity that strong- you cant get that close to a micro black hole without being destroyed ;-)

Stellator- I like the two gravity field method but based on Wat's calculations it sounds like that would be beyond our level of technology for a long time.

Uploading our minds sounds like a better idea, as long as our bodies at home get to share in the experiences!

So based on how long each method would last- would you say a few hundred years for suspended animation/croygenics, a few thousand years for the gravity field method and virtually unlimited for the uploading method?

Ha I love that term "meatsack" I remember it from Supernatural.  And transhumanism's time has come as well as lifting up animals!
 
User avatar
Watsisname
Science Officer
Science Officer
Posts: 2318
Joined: 06 Sep 2016 02:33
Location: Bellingham, WA

Science and Astronomy Questions

18 Jan 2019 08:22

A different spin on the question:  What is the most time dilation we could get by accelerating at 1g?  

If we find a 10 billion solar mass black hole (about the most massive that we know of), then hovering at 12.66 horizon radii would yield about 9.8m/s[sup]2[/sup] of gravitational acceleration, with a time dilation factor of 1.042, which would mean our clocks tick 2.5 seconds per minute (or about 1 hour per day) slower than clocks far away.  

The same time dilation factor around SgrA* (4x10[sup]6[/sup] solar masses) would require an acceleration of 6.8x10[sup]7[/sup] m/s[sup]2[/sup], which is much less practical.  So the black hole's mass matters a lot.

In terms of special relativity, this time dilation factor would occur at 28.1% of the speed of light.


Ah no Wat, I meant to look at one's own past, sort of like a video recording of things that happened in the past, without the ability to change them.  That was in an Asimov short story.
I know.  But you can't.  So I answer in the closest way that nature allows. :)
 
User avatar
Stellarator
World Builder
World Builder
Posts: 889
Joined: 10 Jul 2018 18:24
Location: Sagittarius A*

Science and Astronomy Questions

18 Jan 2019 19:00

So based on how long each method would last- would you say a few hundred years for suspended animation/croygenics, a few thousand years for the gravity field method and virtually unlimited for the uploading method?
Well, there are significant biological hurdles to overcome before any type of stasis is considered. Any form of hibernation (deep comatose states induced by technology), 'freezing' or suspended animation will be tricky to perfect - moreso for each increase in the timelines considered for operation. Ultimately this might be another sci-fi troupe with no real application in reality simply due to so many engineering complications accompanying it. It might only be very niche or just impossible like FTL.

That being said, it really depends on the technology we use. Very advanced civilizations with metamaterials and cybernetical medical sciences could probably engineer a plethora of stasis designs - if they need them. If you are mostly or completely cyborgs or uploaded consciousnesses then stasis is a meaningless term. The durability of the technology, rather then the entity using it, is at question.
Futurum Fusionem
 
A-L-E-X
Galaxy Architect
Galaxy Architect
Posts: 3498
Joined: 06 Mar 2017 20:19

Science and Astronomy Questions

19 Jan 2019 03:28

Wat, so either method is pretty impractical at this point or at any point in the foreseeable future :(  The fastest we can accelerate to in the foreseeable future would be the 0.2c which was targeted by the Icarus Project and 100 year Starship Program.

Stellator, in that case it's a lot of wasted money by those rich folks who have been having their bodies frozen upon death, hoping for science to advance far enough that they may be cured and woken up from their cryogenic slumber.  Likely, they will be far too damaged to be recovered no matter how far science advances by then.

The cyborg option is far better for the durability question you mention.  As for FTL, I still favor some sort of Alcubierre-like solution in the very distant future for out species if we dont go extinct first.  It isn't really FTL but a way to warp the rules a bit (so to type lol.)
 
User avatar
Stellarator
World Builder
World Builder
Posts: 889
Joined: 10 Jul 2018 18:24
Location: Sagittarius A*

Science and Astronomy Questions

19 Jan 2019 17:33

What I wouldn't give for a Star Trek type tractor beam right now..... (is that scientifically feasible in the future)?
As with most such concepts in science fiction, it can be duplicated in reality, but not identically for engineering reasons. Scientists in Spain a while back made a device that could levitate and move around objects above it via ultrasonic soundwaves, it's more of a 'pusher' beam though.

[youtube]51W9dCCdv_4[/youtube]

Obviously this design has limited application in space due to a lack of medium for the soundwaves to travel through.

Over the Pond, NASA is working on a laser-based tractor-beam type piece of technology: https://www.nasa.gov/topics/technology/features/tractor-beam.html
Futurum Fusionem
 
User avatar
Watsisname
Science Officer
Science Officer
Posts: 2318
Joined: 06 Sep 2016 02:33
Location: Bellingham, WA

Science and Astronomy Questions

20 Jan 2019 04:50

Using a laser as a "tractor beam" is surprisingly easy to do at home, provided a laser with sufficiently high power, adjustable focus, and a good Gaussian beam profile.  The way this works is due to the momentum carried by light, and small objects can be levitated and even moved around with great effectiveness.  The experiment demonstrating this effect (Optical Tweezers) also won the Nobel Prize in Physics last year.

A fun youtube demonstration (looks like clickbait but is actually a pretty good channel).

[youtube]Sq7GaO8iqu8[/youtube]
 
A-L-E-X
Galaxy Architect
Galaxy Architect
Posts: 3498
Joined: 06 Mar 2017 20:19

Science and Astronomy Questions

20 Jan 2019 05:21

Thanks, we're finding new uses for lasers all the time!  That new starship project we talked about a few months back also involved lasers, pushing along solar sails to around 0.2c.  So this would be the reverse of that?
 
User avatar
Watsisname
Science Officer
Science Officer
Posts: 2318
Joined: 06 Sep 2016 02:33
Location: Bellingham, WA

Science and Astronomy Questions

20 Jan 2019 05:52

It is much easier to accelerate something to 0.2c by laser than it is to accelerate it to -0.2c (i.e. pull back towards you that fast).  The latter would be like shooting a bullet at a target and expecting the target to fly straight back at you.  Doesn't work that way, since momentum must be conserved.

That small objects can be stably levitated in a laser beam (not drifting out of it), or even moved around with the beam, is very surprising.  A small enough object diffracts the light waves around it, and when you work through the math it turns out that the object will migrate to the most intense part of the beam.  If the beam comes down to a focused point, then the object will migrate to that focus, too.  So if you slowly pull the focus back towards you then this acts like a tractor beam "pulling".  But it's not really pulling it so much as changing the equilibrium point where the object wants to be.
 
A-L-E-X
Galaxy Architect
Galaxy Architect
Posts: 3498
Joined: 06 Mar 2017 20:19

Science and Astronomy Questions

20 Jan 2019 06:42

Wat, your words are excellent at forming an image in my mind.  I pictured manually focusing on a distant target with my camera, or slowly focusing with a telescope (SCT's take particularly long to focus because of their long focus travel, unless you use a motorized focuser) and it actually seems like the way you wrote it is exactly what happens.  The object slowly floats into focus, but once in focus, it's tack sharp and motionless and just appears to hover in midair!

How strong would the laser have to be to stop that object from moving away or even just slowing it down enough so we could study it further?  Is it a function of how far away from the object the source of the laser is as well as how strong and large it is and also the object's size, mass and velocity?
 
User avatar
Watsisname
Science Officer
Science Officer
Posts: 2318
Joined: 06 Sep 2016 02:33
Location: Bellingham, WA

Science and Astronomy Questions

20 Jan 2019 08:41

How strong would the laser have to be to stop that object from moving away or even just slowing it down enough so we could study it further?
Assuming you're referring to 'Oumuamua?  It would have to be so strong that it would generate particle/antiparticle pairs out of the vacuum (I'm not even kidding).  Also, 'Oumuamua would be vaporized, making it more difficult to study. ;)
 
User avatar
midtskogen
Star Engineer
Star Engineer
Posts: 1537
Joined: 11 Dec 2016 12:57
Location: Oslo, Norway
Contact:

Science and Astronomy Questions

20 Jan 2019 08:53

Also, 'Oumuamua would be vaporized, making it more difficult to study.
Image
NIL DIFFICILE VOLENTI
 
A-L-E-X
Galaxy Architect
Galaxy Architect
Posts: 3498
Joined: 06 Mar 2017 20:19

Science and Astronomy Questions

20 Jan 2019 20:22

How strong would the laser have to be to stop that object from moving away or even just slowing it down enough so we could study it further?
Assuming you're referring to 'Oumuamua?  It would have to be so strong that it would generate particle/antiparticle pairs out of the vacuum (I'm not even kidding).  Also, 'Oumuamua would be vaporized, making it more difficult to study. ;)
Wow talk about overkill haha.  It would be better to generate a strong gravitational field to drag it back, except according to the calculations we talked about before, doing that would be nearly impossible.
 
User avatar
JackDole
Star Engineer
Star Engineer
Posts: 1874
Joined: 02 Nov 2016 18:18
Location: Terra

Science and Astronomy Questions

20 Jan 2019 22:11

Until we have developed a tractor beam that will allow us to bring back 'Oumuamua, we probably also have spaceships with which we can fly behind.
I guess in 100 years or so, the time has come.
JackDole's Universe 0.990: http://forum.spaceengine.org/viewtopic.php?f=3&t=546
JackDole's Archive: http://forum.spaceengine.org/viewtopic.php?f=3&t=419
JackDole: Mega structures ... http://old.spaceengine.org/forum/17-3252-1 (Old forum)
 
User avatar
Gnargenox
World Builder
World Builder
Posts: 724
Joined: 11 Dec 2016 20:19
Location: 179° 56′ 39.4″ +0° 2′ 46.2″ @ 7,940 ± 420 pc

Science and Astronomy Questions

20 Jan 2019 22:24

Can you calculate my latitude and longitude?
Screenshot_20190120-215348_SkEye.png
CPU: AMD FX-8350 8 core processor 4GHz / GPU: GeForce GT 730 @ 1920x1080, 60Hz with 1GB adapter RAM / RAM: Patriot Signature 4GB 1600MHz 240-Pin DDR3 (only 2GB work, don't buy it) / Motherboard: MSI 970 Gaming MS-7693
 
User avatar
Stellarator
World Builder
World Builder
Posts: 889
Joined: 10 Jul 2018 18:24
Location: Sagittarius A*

Science and Astronomy Questions

21 Jan 2019 01:41

I don't need to Gnargenox. I know you live somewhere in Texas  :P.
Futurum Fusionem

Who is online

Users browsing this forum: Ahrefs [Bot], Bing [Bot] and 19 guests