Kepler's Laws and Newton's Laws of Motion

Kepler's first law

Each planet moves around the Sun in an orbit that is an ellipse, with the Sun at one focus of the ellipse.

Kepler's second law

The straight line joining a planet and the Sun sweeps out equal areas in space in equal intervals of time.

Kepler's third law

The square of a planet's orbital period is directly proportional to the cube of the semimajor axis of its orbit.

Newton's first law

Every object will continue to be in a state of rest or move at a constant speed in a straight line unless it is compelled to change by an outside force.

Newton's second law

The change of motion of a body is proportional to and in the direction of the force acting on it. (F=ma)

Newton's third law

For every action there is an equal and opposite reaction (or: the mutual actions of two bodies upon each other are always equal and act in opposite directions).

Stefan-Boltzmann Law

The energy flux from a blackbody is proportional to the fourth power of its absolute temperature.

Wien's Law

The wavelength at which the maximum power is emitted by a blackbody is inversely proportional to its temperature.