As described in the dictionary:
hy·poth·e·sis n. pl. hy·poth·e·ses1.A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation.
2. Something taken to be true for the purpose of argument or investigation; an assumption.
3. The antecedent of a conditional statement.
I think that the shell on the egg will come off and the egg will get bigger after a amount of time.