4.3 orbits Flashcards
1
Q
What is Kepler’s first law?
A
Each planet moves in an elliptical orbit with the sun at one focus
2
Q
What is Kepler’s second law?
A
The line joining a planet to the centre of the sun sweeps out equal areas in equal times
3
Q
What is Kepler’s third law?
A
T^2 is proportional to r^3
4
Q
What is the radial velocity
A
Velocity of a star to/away from Earth
