Propellant

MMH / N2O4

Also known as Hypergolic (MMH)

Rockets

Overview

A storable hypergolic combination used in upper stages and orbital-maneuvering systems where reliable restart matters, such as the Ariane 5 storable upper stage.

Knowledge connections

Propellant ofAestus
Associated withBipropellant Propulsion

Sources

The primary and reference sources this topic draws on.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.