Theories are always in a sense speculative, as they build upon other theories and measurements. And as measurements aren't definitive, but just a standardized w

Theories are always in a sense speculative, as they build upon other theories and measurements. And as measurements aren't definitive, but just a standardized way of comparing results, theories are just an abstract framework how we have a shared understanding of the world around us. Theories usually are just based on other theories and just create a theory from the current available data. The less data you have, the larger the possible space that your theory might lie in. Hypotheses are usually things that rework theories because we have some new data that showed that our theories were inaccurate/false/invalid and builds a new framework that more accurately models the data and theories that we have. Take this just with grain of salt, this is just a philosophical view of the meanings of the words as I understand them.