Join for free
Reply
Page 4 of 4 « First < 2 3 4
gumbud's Avatar
gumbud
Chatterbox
gumbud is offline
australia
Joined: Jan 2014
Posts: 10,069
gumbud is male  gumbud has posted at least 25 times and has been a member for 3 months or more 
 
12-09-2018, 05:11 AM
31

Re: search for second earth

the dark side?
Reply With Quote
Dextrous63
Senior Member
Dextrous63 is offline
Manchester, UK
Joined: Jan 2016
Posts: 901
Dextrous63 is male  Dextrous63 has posted at least 25 times and has been a member for 3 months or more 
 
12-09-2018, 02:51 PM
32

Re: search for second earth

Those maps would be explained by somebody having managed to travel through time. Time travel could also open possible solutions for space travel too.
Reply With Quote
Omah's Avatar
Omah
Senior Member
Omah is offline
Preston,UK
Joined: Feb 2014
Posts: 2,232
Omah is male  Omah has posted at least 25 times and has been a member for 3 months or more 
 
12-09-2018, 04:07 PM
33

Re: search for second earth

Originally Posted by Dextrous63 ->
Those maps would be explained by somebody having managed to travel through time. Time travel could also open possible solutions for space travel too.
Well, those time travellers couldn't have been very clever because 16th century maps have an accuracy, at most, of 80%, and that's on the coastline of the Mediterranean. Elsewhere, major inaccuracies occur, as in this map of 1600 by by cartographer Arnoldo di Arnoldi

Reply With Quote
fender's Avatar
fender
Senior Member
fender is online now
United Kingdom
Joined: Jan 2016
Posts: 4,784
fender is male  fender has posted at least 25 times and has been a member for 3 months or more 
 
12-09-2018, 07:57 PM
34

Re: search for second earth

Originally Posted by Dextrous63 ->
Those maps would be explained by somebody having managed to travel through time. Time travel could also open possible solutions for space travel too.
You can't travel back in time.
However, you can travel forward, although in reality it's more a change of state.

For example, if you took off from the Earth, accelerate to light speed and travelled for two hours, turned around and came back, you would be simply 4 hours older. However, circa 7-9 years will have passed on Earth. Time slows when you approach light speed.

This is a proven theory, where atomic clocks were used in space.
Reply With Quote
Dextrous63
Senior Member
Dextrous63 is offline
Manchester, UK
Joined: Jan 2016
Posts: 901
Dextrous63 is male  Dextrous63 has posted at least 25 times and has been a member for 3 months or more 
 
13-09-2018, 08:04 AM
35

Re: search for second earth

Originally Posted by Omah ->
Well, those time travellers couldn't have been very clever because 16th century maps have an accuracy, at most, of 80%, and that's on the coastline of the Mediterranean. Elsewhere, major inaccuracies occur, as in this map of 1600 by by cartographer Arnoldo di Arnoldi[/IMG]
You're not allowing for artistic interpretation of what they'd seen
Reply With Quote
Dextrous63
Senior Member
Dextrous63 is offline
Manchester, UK
Joined: Jan 2016
Posts: 901
Dextrous63 is male  Dextrous63 has posted at least 25 times and has been a member for 3 months or more 
 
13-09-2018, 08:10 AM
36

Re: search for second earth

Originally Posted by fender ->
You can't travel back in time.
Not at present, but maybe in the future

Originally Posted by fender ->
For example, if you took off from the Earth, accelerate to light speed and travelled for two hours, turned around and came back, you would be simply 4 hours older. However, circa 7-9 years will have passed on Earth. Time slows when you approach light speed.

This is a proven theory, where atomic clocks were used in space.
The maths (Lorentz's Relativity Transformations) provide methods for these calculations.

However, if one could travel through time without having to go through the speed of light, and since speed=dist/time, then, er, I'm not sure
Reply With Quote
fender's Avatar
fender
Senior Member
fender is online now
United Kingdom
Joined: Jan 2016
Posts: 4,784
fender is male  fender has posted at least 25 times and has been a member for 3 months or more 
 
13-09-2018, 07:14 PM
37

Re: search for second earth

Originally Posted by Dextrous63 ->
Not at present, but maybe in the future

The maths (Lorentz's Relativity Transformations) provide methods for these calculations.

However, if one could travel through time without having to go through the speed of light, and since speed=dist/time, then, er, I'm not sure
I don't think our current laws forbid going back in time per se.
However, it depends if the theorized negative energy actually exists, and if it does, can we control it.
Possible in theory, probably not in practicality.
Reply With Quote
Dextrous63
Senior Member
Dextrous63 is offline
Manchester, UK
Joined: Jan 2016
Posts: 901
Dextrous63 is male  Dextrous63 has posted at least 25 times and has been a member for 3 months or more 
 
14-09-2018, 06:43 AM
38

Re: search for second earth

Originally Posted by fender ->
I don't think our current laws forbid going back in time per se.
However, it depends if the theorized negative energy actually exists, and if it does, can we control it.
Possible in theory, probably not in practicality.
Indeed. https://en.wikipedia.org/wiki/Alcubierre_drive

Fascinating read, most of it way above my head!!!
Reply With Quote
OldGreyFox's Avatar
OldGreyFox
Chatterbox
OldGreyFox is offline
South Yorkshire
Joined: Feb 2015
Posts: 7,757
OldGreyFox is male  OldGreyFox has posted at least 25 times and has been a member for 3 months or more 
 
14-09-2018, 10:08 AM
39

Re: search for second earth

We are already zooming through space at a 'Zillion' miles per hour as we engage in our annual circumnavigation of the sun... Why don't we just get off and wait for the rest of space to come to us?

The Earth is just a giant spaceship....
Reply With Quote
Dextrous63
Senior Member
Dextrous63 is offline
Manchester, UK
Joined: Jan 2016
Posts: 901
Dextrous63 is male  Dextrous63 has posted at least 25 times and has been a member for 3 months or more 
 
14-09-2018, 11:25 AM
40

Re: search for second earth

Originally Posted by OldGreyFox ->
We are already zooming through space at a 'Zillion' miles per hour as we engage in our annual circumnavigation of the sun... Why don't we just get off and wait for the rest of space to come to us?
A most interesting proposition It'd be equivalent to jumping off a boat on a fast and deep river (drifting downsteam) and trying to swim against the current so that one is stationary relative to the bank, and waiting for the next boat to drift along. Good luck with that
Reply With Quote
Reply
Page 4 of 4 « First < 2 3 4

Thread Tools


© Copyright 2009, Over50sForum   Contact Us | Over 50s Forum! | Archive | Privacy Statement | Terms of Use | Top

Powered by vBulletin Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.