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Pluto

Hydrazine

Explanation: New Horizons has both spin-stabilized (cruise) and three-axis stabilized (science) modes controlled entirely with hydrazine monopropellant. Hydrazine is a colourless flammable liquid with an ammonia-like odor. It is highly toxic and dangerously unstable and must be handled with extreme care by spacecraft technicians.

Image credit: Wikipedia.

2015-04-17