U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Science and Technology > Space
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
Reply Start New Thread
 
Old 02-25-2017, 02:57 PM
 
164 posts, read 98,633 times
Reputation: 272

Advertisements

There are some significant issues with traveling at SoL...

https://what-if.xkcd.com/1/
Reply With Quote Quick reply to this message

 
Old 02-25-2017, 05:02 PM
 
Location: Type 0.7 Kardashev
10,576 posts, read 7,461,408 times
Reputation: 37532
Quote:
Originally Posted by Tek_Freek View Post
Ramp up to the speed of light. At the halfway point turn around and decelerate the rest of the way. I'd guess more like 10 years at least.
At 50% luminal the Lorentz factor is only 1.15 - which means that for the interstellar traveler who ages 1 year, those back on Earth will age 1.15 years, or 1 year and 55 days. And given that that virtually the entire journey you proposed would experience even less time dilation, the overall relativistic effects would be pretty minor. You have to get to a Lorentz factor of almost 90% before the traveler's time passing is less than half of that for the observer. Even at 99% luminal it's only 7x.
Reply With Quote Quick reply to this message
 
Old 02-25-2017, 05:09 PM
 
Location: North Beach, MD on the Chesapeake
34,460 posts, read 43,314,558 times
Reputation: 44157
Two days at Warp 7.
Reply With Quote Quick reply to this message
 
Old 02-25-2017, 05:22 PM
 
Location: alabama.
2,322 posts, read 1,829,196 times
Reputation: 4700
Quote:
Originally Posted by LifeIsGood01 View Post
Does it mean we would need to travel for 4 years at the speed of light, if it were possible, in order to get there?
is there some reason you need to get there faster ?
Reply With Quote Quick reply to this message
 
Old 02-25-2017, 06:40 PM
 
Location: Brooklyn, NY.
567 posts, read 372,538 times
Reputation: 475
Easy. Just apply E=MC2.
Meaning, you get energy when mass is multiplied by SOL2.
Thus, if your space ship has a mass of 5Tons, you take that X SOL then square it, and bartle doo your gets yer energy enough to take your tuhis to the stars.
Reply With Quote Quick reply to this message
 
Old 02-25-2017, 09:54 PM
 
Location: Western U.S.
375 posts, read 188,606 times
Reputation: 410
Quote:
Originally Posted by LifeIsGood01 View Post
Does it mean we would need to travel for 4 years at the speed of light, if it were possible, in order to get there?
Exactly!

The closest star (actually a binary 2-star system) to Earth--excluding our own sun of course, which is simply a very average main sequence star--is the Proxima Centauri system. It is 4.3 LY away from us. So, at speed-of-light travel it would STILL take a tad over four years to get there! Mind boggling, ain't it! Take a look at a pic of our Milky Way Galaxy and see all those stars! There are about 200 billion or so. And to think that just the closest one of those is over four light years away.

At speed of light travel (solt) it would take about 200,000 years just to cross our Galaxy from edge to edge!

And to wit: there are hundreds of billions of other galaxies.

Our sun is a mere 93 million miles away. The light from it to reach us here on Earth takes about 8 minutes. That distance is called an Astronomical Unit. (AU).

OF course we currently have no propulsion technology capable of reaching anywhere near light speeds. And we probably never will. At present, with our bestest fastest technology, it would take us nearly 12,000 years to reach Proxima Centauri.

And yes....I a Cosmology nerd! LOL
Reply With Quote Quick reply to this message
 
Old 02-26-2017, 12:23 AM
 
1,811 posts, read 1,195,708 times
Reputation: 1892
Where are the Voyagers - NASA Voyager

40 years and they're barely into interstellar space. It will take a radically different sort of propulsion to make interstellar traveling anything but multi-generational. Or as I read in some book once "space is really big".
Reply With Quote Quick reply to this message
 
Old 02-26-2017, 09:41 AM
 
Location: God's Gift to Mankind for flying anything
5,374 posts, read 11,284,151 times
Reputation: 4210
Quote:
Originally Posted by LAX Star View Post
At speed of light travel (solt) it would take about 200,000 years just to cross our Galaxy from edge to edge!
Then when you get there, you may find it is not there anymore ...
What did you see when you started out 200,000 years back ?
Whatever you saw, took 200,000 years to get to *you*, then another 200,000 years for you to get there, that is 400,000 years ...

Aw shucks ...
At least more fun to dream about stuff like this then to think of even more stupid things to say about our politicians ...
Reply With Quote Quick reply to this message
 
Old 02-26-2017, 10:04 AM
 
Location: On the road
2,687 posts, read 2,043,378 times
Reputation: 2954
Quote:
Originally Posted by irman View Post
Then when you get there, you may find it is not there anymore ...
What did you see when you started out 200,000 years back ?
Whatever you saw, took 200,000 years to get to *you*, then another 200,000 years for you to get there, that is 400,000 years ...

Aw shucks ...
At least more fun to dream about stuff like this then to think of even more stupid things to say about our politicians ...
Well, that would be what you deserve for not purchasing the "trajectory Adjustment Feature" that tracks the destination and calculates your trajectory to arrive at the place where your destination will be when you get there.
Reply With Quote Quick reply to this message
 
Old 02-26-2017, 10:35 AM
 
Location: God's Gift to Mankind for flying anything
5,374 posts, read 11,284,151 times
Reputation: 4210
Quote:
Originally Posted by LarsMac View Post
Well, that would be what you deserve for not purchasing the "trajectory Adjustment Feature" that tracks the destination and calculates your trajectory to arrive at the place where your destination will be when you get there.
Now you tell me !
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology > Space
Similar Threads
Follow City-Data.com founder on our Forum or

All times are GMT -6. The time now is 04:07 PM.

© 2005-2019, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 - Top