nongravitational
adjective
non·grav·i·ta·tion·al
| \ ˌnän-ˌgra-və-ˈtā-shnəl
, -shə-nᵊl\
, -shə-nᵊl\
Definition of nongravitational
: not of, relating to, or caused by gravitation : not gravitational
Each time a periodic comet revisits the inner solar system, it can experience the gentle effects of dust-bearing gas jets erupting on its sun-warmed surface. These so-called nongravitational forces can advance or retard a comet's date of return by hours or years.— Daniel Pendick
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