Fundamentally, science is simply this: Observe. Theorize. Repeat.
Intervention via experiment is another fundamental part of science.
"experiment" is just a formal, controlled method for gathering observations.
Consider an experiment which tests the effects of a chemical on mice.
The scientist purposely exposes the test group to the chemical and actively controls the environment of both the test and control group.
Experiment is intervention even above the quantum scale.
Fundamentally, science is simply this:
Observe. Theorize. Repeat.
Many of the observations in science take place in a controlled, repeatable laboratory setting. Many do not; astronomers can't exactly drag other galaxies into the lab.