A number of techniques developed since the 1950s have placed the study of these subjects on a sounder and more objective footing.
What does the underlined part mean?
e. a larger set of proven facts more objective = based on scientific methods, which are based solely on evidence and proven facts footing = what you stand on
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sounder = more scientifically based, i.e. a larger set of proven facts
more objective = based on scientific methods, which are based solely on evidence and proven facts
footing = what you stand on