No, as One of the fundamental principles of experimental science is that no real measurement is infinitely precise, but instead must necessarily include a degree of uncertainty in the value.
Yes, As the Newtonian Equations is the most deterministic model of motion of any object
No, as it is impossible to actually measure the initial positions and speeds of the planets to infinite precision, and a very tiny imprecision in the initial conditions would grow in time at an enormous rate.
No. The practical difficulty are the limits of computer power. Even with the help of calculators, desktop computers, Super Computers the long-term calculations were too lengthy. The conclusion from all this is that while new real-life chaos discoveries a