Jupiter’s moon Io has an orbit around Jupiter with a constant
radius of 420,000 km and completes an orbit
in a period of 1.8 days.
Does Io obey the standard version of Kepler’s laws? If not, wh
ich laws are different and why?
If Jupiter’s moon Europa has an orbit with a constant radius o
f 670,000 km, estimate how long Europa
should take to orbit Jupiter. You should answer this questio