the planets align every millenia
The time it takes to get from one planet to another depends on the departure and arrival planets. It can take about two years to get from Earth to Mars where it will take about six years to get from Earth to Jupiter.
How many years after Luther’s criticism did Galileo begin to study planets?
It is extremely rare for all of the planets in our solar system to align perfectly in a straight line due to their individual orbits and distances from the sun. The last time a near-perfect alignment of the planets occurred was in 561 BC, and there is no scientific evidence to suggest that such an event will happen again in the foreseeable future.
6
36 years
3 years
About 4.5 billion.
18
114
1500
11
4 years apart