Even theories change (1 of 4)
Science is always a work in progress and even theories change. For example, in the 1600s classical mechanics was the accepted explanation of the movement of objects both in space and on Earth.
Even theories change (2 of 4)
Then classical mechanics was one-upped by Albert Einstein's theory of special relativity because it explained more phenomena.
Even theories change (4 of 4)
General relativity seems up for a change. For example, it doesn't mesh with what we know about the interactions between extremely tiny particles. Will physicists develop a new theory that simultaneously helps us understand the interactions between the very large and the very small?