Explanations attributing phenomena to luck are weak at best, if not inadequate. When we're unable to recognize, understand or control the causes, we label the outcome as luck, randomness or chaos. Although some phenomena appear to be random or chaotic, all phenomena are deterministic, meaning that their future dynamics are fully defined by their initial conditions, with no random elements involved.
All events, conditions, and circumstances are predetermined—they have natural causes. Luck seems to be a term we use to lightly dismiss complex deeper causes in the analysis of ‘success’ or ‘failure.’ Science is striving to remove mystery, and learn more about the actual physical processes of the causes and effects of phenomena.
Luck implies unseen factors, which often may be anticipated, prepared for, and discovered.