Albert Einstein made the theory of relativity.
His famous theory of relativity
He is a German scientist who studied cells.He made the cell theory.
Its the Lewis Theory He also made the theory about the electron dot structures
It's the cell theory, I forgot the other ones but one of them is all living things are made up of cells
Schledin, Schwann, and Virchow. I do not know their first names so you will have to look them up.
You are referring to Albert Einstein's Theory of Gravity.
A hypothesis is an educated guess made by scientist or well normal people like you and me, but a theory gets tested by various other scientist and also regular people.
Theodor Schwan in 1839.He also contributed in building cell theory.
Theodor Schwann concluded that all animals are made up of cells. He is a German scientist who developed the cell theory.
The atomic theory that was supported by Mendeleev when scientist found the elements that Mendeleev predicted was out there in the world. When Mendeleev made the periodic table he left spots for elements he did not have but knew would be found one day.
It depends what you belive, and weather you are religious or not, scientist believe thet it ALL started with the big bang, search 'big bang theory'.