Posted on 02/23/2018 9:21:36 PM PST by MtnClimber
This is not correct.
Because that star system would have to consist of a massive Black Hole, and to "loop around," as you say, you would have to practically "skim" the Black Hole's Event Horizon.
By the time you reached max. velocity, at the Galaxy's edge, and wanted to reverse your direction and go home, you would have a velocity of, say, 0.99997 c ("c" = velocity of light). Doing a "flyby" (as is routinely done by Nasa's space probes, when they swing by Jupiter or Saturn or such to get an extra little "push" and speed them on their way to, say, Neptune) can never increase / decrease your velocity by more than the escape velocity of the celestial body you are swinging by.
Thus, only Black Holes would be suitable for your purpose.
Since you would be in free fall, you would not feel the sudden deceleration and acceleration as you rounded the Black Hole - but the tidal forces (see Larry Niven's "Neutron Star") would make spaghetti of you.
Regards,
1g is no small acceleration by today’s standards. And maintaining it for more than a few minutes would require something like nuclear power. Maintaining it for 4 years would require something far beyond that. And another problem arises: when you get close enough to the speed of light, ordinary atoms in space become deadly cosmic rays. A couple years acceleration at 1g will fry the astronauts unless they have tons of lead shielding for every square foot.
That planets distance from its red dwarf sun/star is only 19 times the distance our moon is from earth yet temps would be life sustaining for little green men
Our own Mercury is nearly 9 times as far away from our Fat Old Sun as proxima b is from its sun Proxima Centauri the red dwarf
Amazing stuff
I think our very own Oort Cloud which is the outer limits of our solar system..Hill Sphere sorta the limit of our sun gravity pretty much is also only 3 or less light years in some outer points from the Alpha Centauri system and is affected to some degree by that gravitational pull as well
the beginning of interstellar space for us
I love this stuff
Thanks for posting
I read astronomy for leisure.....I have pondered the vastness since I was a kid when camping out in rural areas with good visible night sky panorama
The two times Ive been near death in my life Ive had an impulse to be outside to see the sky as a conduit of comfort considering I was in serious mortality trouble
I wonder if thats normal
Sometimes I feel I can sense Gods portal through it all....its just nothing to our creator....like opening a box to us...at most
Its like watching a birth or watching folks face certain death doing the right thing ....watching the vastness of space inspires confidence in our Lord or a creator
Wonder how many astronomers and astrophysicist are non believers
Not many obstetricians or oncologists are atheists
The Centauri group is really close relatively speaking in our galaxy
Cixin Liu’s “Three Body Problem” details how it might be to live in that system, the follow on sequels further delineate how Earth might interact and why we hear no other radio sources from other civilizations.
Skimming the gravitational pull outer limits (is that same as the Hill Sphere of a star?) black holes sounds like a risky endeavor akin to snake charming or placing head in lions mouth at the circus
And the mass density issues I assume start there no?
One analogous description of black hole density always stuck with me....a thimble of Black Hole matter in a black hole would have the weight of a full supertanker
Thats exponentially more than pressures at our deepest ocean depths
14.5 more pounds pressure every 33 feet of depth
I guess challenger deep pressure is 15,000 psi
But in reality Im wrong I think because isnt the point of massive density in a black hole the absolute center?
Some scientists say an all consuming black hole can be less dense than water except that precise center of the hole
Its over my head
The turning radius of a Tesla Roadster at lightspeed isn’t all that great.
WHAT MYSTERIES LURK AT PROXIMA CENTAURI?
A Klingon penal colony.
I checked the thread where those numbers came from, and it had a link to another thread where there were equations to calculate relativistic effects. Unfortunately, the link was dead.
If interested to “drill” further, there must be many alternatives to search for. Online plug-in calculators and the like. The sites themselves may come and go, depending on the funding behind it.
It makes sense to me - time dilation is a proven real thing. Fascinating to the imagination, obviously this ‘aint happening anytime soon. You can travel at .95c, but getting there will be a hurdle!
I’m interested in the exact relationship between relativistic speeds and time dilation. I’ve had a story in my head for years in which that relation is a major plot element, but I’ll never write it unless I can quantitate that relationship. And I’m a biochemist, so I learned to quantitate, never quantify...
For now.
I had that book!
Not a physicist either, but the “fudge factor” for mass is given by 1/sqrt(c^2 - v^2). As you can see, as v approaches c, that number goes toward infinity. I’d suppose the factor for time dilation is the same.
Before long we’ll be dashing up to Proxy-C for a weekend getaway!
Thanks fieldmarshaldj.
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"The Nearest Star song" - Sheldon Cooper, The Big Bang Theory S04E05 (The Desperation Emanation)
With enough fried chicken they can go anywhere!!
Fascinating
Tks for the link
No question earth is pretty unique from what we can now see and we can see a whole lot
What i find also telling is how much of the universe in its perpetual movement tends towards most being on similar axis patterns
Like a giant clock
Yes there are anomalies
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