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Planet formation

The core problem

Controversy over shock-wave experiments on the compression of hydrogen has broad implications — for understanding the cores of Jupiter and Saturn, and even the formation of extrasolar planets.

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Figure 1: Formation of Jupiter and Jupiter-like planets.



  2. Saumon, D. & Guillot, T. Astrophys. J. 609, 1170–1180 (2004).

    Article  ADS  CAS  Google Scholar 

  3. Collins, G. W. et al. Science 281, 1178–1181 (1998).

    Article  ADS  CAS  Google Scholar 

  4. Knudson, M. D., Hanson, D. L., Bailey, J. E., Hall, C. A. & Asay, J. R. Phys. Rev. Lett. 87, 225501 (2001).

    Article  ADS  CAS  Google Scholar 

  5. Hubbard, W. B., Burrows, A. & Lunine, J. I. Annu. Rev. Astron. Astrophys. 40, 103–136 (2002).

    Article  ADS  Google Scholar 

  6. Podolak, M., Hubbard, W. B. & Pollack, J. B. in Protostars and Planets III (eds Levy, E. H. & Lunine, J. I.) 1109–1147 (Univ. Arizona Press, Tucson, 1993).

    Google Scholar 

  7. Burrows, A., Hubeny, I., Hubbard, W. B., Sudarsky, D. & Fortney, J. J. Astrophys. J. 610, L53–L56 (2004).

    Article  ADS  Google Scholar 

  8. Fischer, D., Valenti, J. A. & Marcy, G. IAU S219, ASP Conference Series (in the press);


  10. Lubow, S. H. & Artymowicz, P. in Protostars and Planets IV (eds Mannings, V., Boss, A. P. & Russell, S. S.) 731–755 (Univ. Arizona Press, Tucson, 2000).

    Google Scholar 

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Hubbard, W. The core problem. Nature 431, 32–33 (2004).

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