Look at the picture, thats my question

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?

Stage in which a typical star has completely stopped fusion

What must occur for air masses to form fronts