There's been some work recently on using Hydroxylammonium nitrate (HAN) as a less toxic and better performing replacement for Hydrazine. https://en.wikipedia.o

There's been some work recently on using Hydroxylammonium nitrate (HAN) as a less toxic and better performing replacement for Hydrazine. https://en.wikipedia.org/wiki/Hydroxylammonium_nitrate https://en.wikipedia.org/wiki/Hydroxylammonium_nitrate https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19960048008.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/199600...