Science is a way of thinking, asking questions, and combining observation with knowledge to understand the physical Universe.
Science is ongoing, we never stop questioning our current scientific knowledge, particularly in light of "new" observations. Every law, theory, or hypothesis in science is subject to change if new observations show a flaw in the ideas or concepts involved.
Carl Sagan lists three essential elements in scientific studies:
Underlying all science is the fundamental assumption that we can know the Universe.