What's cosmology

Is cosmology really a science?
Cosmology (the study of the physical universe) is a science that, due to both theoretical and observational developments, has made enormous strides in the past 100 years._{Sep 26, 2017}.
Theories of cosmology
Cosmology can be a difficult discipline to get a handle on, as it is a field of study within physics that touches on many other areas. (Although, in truth, these days pretty much all fields of study within physics touch on many other areas.).
What is basic cosmology?
Cosmology is a branch of astronomy that involves the origin and evolution of the universe, from the Big Bang to today and on into the future.
According to NASA, the definition of cosmology is "the scientific study of the large scale properties of the universe as a whole."_{Feb 21, 2022}.
cosmology, field of study that brings together the natural sciences, particularly astronomy and physics, in a joint effort to understand the physical universe as a unified whole._{5 days ago}

Is cosmology really a science?