Hi everybody,
I think that theory and observation are complementary to each other.
We observe the universe to check our theories. If we had not theories, our observations would be nothing but a database, and we wouldn't know what's next.
About the 'theories being disproved ' thing, I can say that the new theories based on earlier disproved theories are new steps on the path to knowledge. Theories tested, proved/disproved, new theories based on the more accuratre observational data,... this is a cycle, which we ride on this path.
Cosmology is not a waste of time, but if you think that astronomy and knowledge themselves are unnessecary , then you might not agree. Theories are neeeded, very, very much.
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