The author further explains that the gravity coming from this type of star has to be spherically symmetric. This means that the star should only depend on the distance from the star (Hawley and Holcomb 1998). As a result of this fact, it was not possible to disregard the angular terms (Hawley and Holcomb 1998). Lastly, the star along with its gravitational field do not change with time, this means that the metric terms are independent of time, but only when the time coordinate is chosen correctly (Hawley and Holcomb 1998). The time coordinate Schwarzschild used was a rational one because it can be correlated to the time calculated by an observer who was a significant distance away from the central mass, where gravity's effects ebb down to zero (Hawley and Holcomb 1998).

The authors point out that Schwarzschild radius is the identical to the radius used for the Newtonian...
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