A program which simulates the movements of astronomical objects under the
influence of gravity.  For example, you can simulate the solar system or
two stars circling around each other.  

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  300     628  47.8% -lh5- be59 Dec 31  1990 Gravity.info
[generic]                   28      28 100.0% -lh0- 8a60 Dec 31  1990 Gravity/.info
[generic]                 8924   19696  45.3% -lh5- 1fa8 Dec 31  1990 Gravity/Gravity
[generic]                 1672    3704  45.1% -lh5- c64f Dec 31  1990 Gravity/Gravity.doc
[generic]                  640     734  87.2% -lh5- 3581 Dec 31  1990 Gravity/Gravity.doc.info
[generic]                 8905   19696  45.2% -lh5- ce6f Dec 31  1990 Gravity/GravityPAL
[generic]                  123     149  82.6% -lh5- dc7c Dec 31  1990 Gravity/ReadMe.fnf
[generic]                   56      71  78.9% -lh5- 1a10 Dec 31  1990 Gravity/sun_earth
[generic]                   96     174  55.2% -lh5- b970 Dec 31  1990 Gravity/sun_inner_planets
[generic]                   96     174  55.2% -lh5- b970 Dec 31  1990 Gravity/sun_outer_planets
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        10 files   20840   45054  46.3%            Dec 31  1990