I think there was one missing comment in the OP's source:
/** Standard gravity (g) on Earth. This value is equivalent to 1G */
public static final float STANDARD_GRAVITY = 9.80665f;
/** Sun's gravity in SI units (m/s^2) */
public static final float GRAVITY_SUN = 275.0f;
/** Mercury's gravity in SI units (m/s^2) */
public static final float GRAVITY_MERCURY = 3.70f;
/** Venus' gravity in SI units (m/s^2) */
public static final float GRAVITY_VENUS = 8.87f;
/** Earth's gravity in SI units (m/s^2) */
public static final float GRAVITY_EARTH = 9.80665f;
/** The Moon's gravity in SI units (m/s^2) */
public static final float GRAVITY_MOON = 1.6f; //That's no moon....Obi.
/** Gravity (estimate) on the first Death Star in Empire units (m/s^2) */
public static final float GRAVITY_DEATH_STAR_I = 0.000000353036145f;