Changes

The '''Pioneer anomaly''' refers to deviations in projected courses for several spacecraft sent to the outer solar system.  The effect is believed to have influenced the courses of both Pioneer spacecraft, Galileo, and Ulysses.  The courses for the Voyager spacecraft and Cassini were not able to be predicted accurately due to known but unpredictable effects on these craft, and if the anomaly affects these spacecraft, it would not be distinguishable from other effects.

The '''Pioneer anomaly''' refers to deviations in projected courses for several spacecraft sent to the outer solar system.  The effect is believed to have influenced the courses of both Pioneer spacecraft, Galileo, and Ulysses.  The courses for the Voyager spacecraft and Cassini were not able to be predicted accurately due to known but unpredictable effects on these craft, and if the anomaly affects these spacecraft, it would not be distinguishable from other effects.

The Pioneer anomaly may be evidence that our understanding of gravity (Newtonian mechanics and [[General relativity|general relativity]]) needs to be improved.

The Pioneer anomaly may be evidence that [[General relativity|general relativity]]) is incorrect, and that Newtonian mechanics is also incorrect.

==Discovery==

==Discovery==