Science is the branch of study which seeks to observe, discover, and understand how the universe and everything in it works. The scientific method, which is a systematized attempt to learn through observations, hypothesis, testing to validate or invalidate the hypothesis, and developing a theory (a principle generally accepted to be a true) that sufficiently explains the phenomena.
There are different fields of science: physical sciences (physics, space, chemistry, etc.), earth sciences (atmospheric, paleontology, geology, oceanography, etc.), life sciences (evolution, ecology, neuroscience, etc.), medical sciences (pharmacology, clinical research, aging, etc.), social sciences (anthropology, archaeology, psychology, etc.).
In brief, science is discovering and explaining the unexpected.
Science, however, is not about providing moral explanations for things. Nor does it deal with purpose/intent (which requires a mind) or beauty which is a subjective experience of persons or value.