What is motion i don't know what it is

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

How do scientists think that gravity affected the formation of our solar system?