How long an interstellar journey will take

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No technobabble, realistic look at travel to other star systems. Maybe watch this if you're a science fiction writer.

Contents
00:00 - Introduction
00:50 - Wait/start problem
01:27 - Acceleration
03:12 - Relativity
05:10 - Trip duration
08:03 - Interstellar propulsion
13:03 - Energy
15:20 - Efficiency ideas
17:15 - Conclusion


References
[1] Alpha Centauri system by Pablo Carlos Budassi

[2] Stars Over Cape Town by Omaranabulsi

[3] RAF Typhoon Flight Over the UK, Contains public sector information licensed under the Open Government Licence v3.0.
[4] Air Force 9.0 g Centrifuge by Lance Cheung

[5] Alpha Centauri and the Southern Cross by the European Southern Observatory
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[6] Denver International Airport, Report by United States General Accounting Office, GAO/T-RCED/AIMD-95-184
[7] Flughafen Berlin-Brandenburg (BER), Terminal 2 by Günter Wicker

[8] A depiction of the wheat and chessboard (or rice and chessboard) problem by User McGeddon

[9] 3D cut of the LHC dipole , CERN, OPEN-PHO-ACCEL-2014-003-8

[10] View of LHC Tunnel, CERN, CERN-SI-0107014-01

[11] Sapphire Capillaries by Marilyn Chung/Berkeley Lab

[12] Log fire burning by Zouavman Le Zouave

[13] Video of a Cloud chamber of the LMU by Michael F. Schönitzer

[14] The ASACUSA experiment's RFQ by CERN, CERN-EX-1102074-05

[15] Zoom in onto the stellar black hole NGC 300 X-1, ESO/Digitized Sky Survey 2/P. Crowther/L. Calçada

[16] A ‘fly to’ WASP-76, the star around which WASP-76 b orbits, ESO/L.Calçada/spaceengine.org

[17] Dipole animation, CERN-FOOTAGE-2014-024-003