''ASTRONOMY ...a lot of changes occur in astronomy on a regular basis, almost as fast as the probes go up.''
This is not an example of -''Keep the good, drop the bad. Scientists do this all the time.''- because of personal preference or desire. It is good science, updating our understanding of the natural world....which nobody claims is complete.
The same is true for each and every example you gave, you did not give examples of ''keeping the good, drop the bad'' in the sense of personal desire or preference, instead, your examples show how well science works, adding information where we had none, modifying wherever modification is required. That is good science.
'''Do I need to go on ?''
You need to....you could give an actual example of habitual ''keeping the good, dropping the bad'' in the sense you implied was happening, personal beliefs, preferences, etc....which your examples did not reflect. In other words, supporting what you claimed was happening ''all the time''
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