Taken from Seminar Poincare, Einstein 1905-2005 page 106.(adsbygoogle = window.adsbygoogle || []).push({});

The section from which it is taken is called "A comfortable trip for the Langevin traveler", comfortable because the acelerations for the inward and outward journey are just plus and minus g, equivalent to earth's gravity, and the forces involved at the (instantaneous) turnaround are said to be easily handled by human beings. The article points out that considerable, prohibitive amounts of fuel, comparable to planetary masses, would be required for the longer journeys and the gravitational effects of such large fuel masses are ignored in the calculation. It also assumes that the journey takes place in flat Minkowski spacetime.

[tex]

\begin{tabular}{| c | c | c |}

\hline Traveller's proper time & Earth' proper time\\

\hline 1 year & 1 year 4 days\\

\hline 2years & 2years and 1month \\

\hline 4 years & 4.7 years \\

\hline 8 years & 14.5 years \\

\hline 16 years & 104 years \\

\hline 20 years & 297 years \\

\hline 28 years & 2,200 years\\

\hline 32 years & 5,960 years \\

\hline 40 years & 44,000 years \\

\hline 48 years & 326,000 years \\

\hline 60 years & 5.54x$10^6$ years \\

\hline 72 years & 131x$10^6$ years \\

\hline 84 years & 2.64x$10^9$ years \\

\hline 86 years & 5 billion years \\

\hline

\end{tabular}

[/itex]

Matheinste.

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# The twins-some values.

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