A moon orbits a planet in an elliptical
orbit. The foci of the ellipse are 50, 000 km
apart. The closest approach of the moon
to the planet is 400, 000 km. What is the
length of the major axis of the orbit?
a) 400, 000 km
b) 450, 000, km
c) 800, 000 km
d) 850, 000 km
