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By Claudio Maccone

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Extra resources for Deep Space Flight and Communications: Exploiting the Sun as a Gravitational Lens (Springer Praxis Books Astronautical Engineering)

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2] S. , ``Gravitational Lenses,'' Physical Review, 133 (1964), B835±B844. [3] V. Eshleman, ``Gravitational Lens of the Sun: Its Potential for Observations and Communications over Interstellar Distances,'' Science, 205 (1979), 1133±1135. Sec. 9 References 15 [4] F. Drake, ``Stars as Gravitational Lenses,'' Proceedings of the Bioastronomy International Conference, held in BalatonfuÈred, Hungary, June 22±27, 1987, G. Marx (editor), pp. 391± 394. [5] N. Cohen, ``The Pro's and Con's of Gravitational Lenses in CETI,'' Proceedings of the Bioastronomy International Conference, held in BalatonfuÈred, Hungary, June 22±27, 1987, G.

Young protostars At the moment only estimates are available of the distances to these objects. Parallactic distance measurements by FOCAL would permit a more accurate determination of their luminosity and thus of their age. The concern regarding these objects is to determine if they have completed their assemblage of mass or if they are still accreting material to build their ®nal mass [3]. 5 [Ch. 2 Targets of opportunity As other Earth-based and Earth-orbiting astronomical observatories come to life, many new objects will be discovered in our Galaxy and in other galaxies.

His introduction is just qualitative, however. 4 by the new equation found by the author to relate the magni®cation of the lensing star, the distance of the ET transmitter, and the power of the ET transmitter. 5 another application of GL-SETI is provided in case SETV, the Search for Extra-Terrestrial Visitation (within the solar system) is proved in the future to be real science, rather than pure science ®ction. In Chapter 7 the ®rst investigation (to the best of our knowledge) is presented about the gravitational lenses of the four nearest stars to the Sun in the Galaxy: Alpha Centauri A, B, C (Proxima), and Barnard's star.

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