Page:Benton 1959 The Clock Problem (Clock Paradox) in Relativity.djvu/42

 In Italian.

Translated title: The International Astronautical Congress at Barcelona - 6-12 October 1957.

Survey of developments and discussion of the behavior of clocks during travel in the curved space-time of the general theory of relativity, and analysis of the effects observable in journeys in the solar system or on earth satellites.

In German.

Translated title: On the bridging of interstellar space.

Shows that photon rockets traveling close to the speed of light may eventually make possible return journeys to points 25 light years away. Time dilatation effects will become appreciable, and enormous mass ratios will be required.

Discusses power requirements and transit times for Earth-Mars transits.

A consideration of the criticism by John Spaulding of the author's former paper on the subject, with the conclusion that further work appears merited both as a test of certain aspects of relativity and as a means of predicting the future of interstellar travel.

Presents data to show that both astronomically and terrestrially, relative velocities greater than c are in existence.

In French.

Translated title: Permanent motions of a perfect thermodynamic fluid.