On May 23, 3:01*pm, Pat Flannery wrote:

You will have to go through a lot of atmosphere to get a significant
amount of nitrogen, but that's a lot easier than dragging it all the way
back from Pluto.

Oh, definitely. I was thinking of going to Pluto and staying there to
enjoy the nitrogen, not bringing it to Mars.

If more nitrogen is to be dragged to Mars, one would use comets as the
source.

John Savard