Originally Posted By: ventilator
the earth will fall into the sun sooner or later though. laugh so it's not a perpetuum mobile. just very long running.


right , some meters a years, because there is some cosmic dust along its orbit
However it may exist in some remote part of the universe a planet moving along a 100 % clean path
This would be e perpetuum mobile
Instead of a planet I mentioned the atoms
Nobody has ever seen an electron falling on the nucleus


Last edited by AlbertoT; 01/05/11 21:08.