Tema A Describe and discuss in no more than 3 pages an open problem in modern astrophysics, and your ideas on possible contributions to its solution Discuss in no more than 2 pages 2 out of the 3 following topics: 1) Clusters of galaxies (focus only on theory or on observations) 2) Final phases of stellar evolution 3) Describe a telescope system with special attention on its specific scientific potential Tema B Describe and discuss in no more than 3 pages an open problem in modern astrophysics, and your ideas on possible contributions to its solution Discuss in no more than 2 pages 2 out of the 3 following topics: 1) Energy transport in stellar interiors 2) Synchrotron or thermal bremsstrahlung or Compton scattered radiation in astrophysics 3) Signal to noise ratio optimization in astrophysical measurements Tema C Describe and discuss in no more than 3 pages an open problem in modern astrophysics, and your ideas on possible contributions to its solution Discuss in no more than 2 pages 2 out of the 3 following topics: 1) Mass to light ratio in stars or in stellar systems 2) Detectors in astrophysics (select a wavelength range) 3) Minor objects in the solar system