Bjarne
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Are all the planets moving away from the Sun?
If so, how much?
If so, how much?
Janus said:It's just not that simple. There are a lot of factors that influence a planet's orbit, including perturbation from other planets and the fact that the Sun is slowing losing mass.
Here's two tables showing the orbital elements and their rate of change for two time intervals: 1800 AD - 2050 AD and 3000 BC - 3000 AD The first column gives the average radius of the orbit and its rate of change. Note that some planets move out and some move in, and that can differ over the two time intervals.
http://ssd.jpl.nasa.gov/txt/p_elem_t1.txt
http://ssd.jpl.nasa.gov/txt/p_elem_t2.txt