Those three types of acceleration — gravitational, linear, and rotational — are the only ones we have that will have the effects of gravity. Which is a big, big problem aboard a spaceship.

Radial acceleration relation found in all common types of galaxies. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2017 / 02 / 170217012502.htm ...

Fermi-type acceleration of interstellar ions driven by high-energy lepton plasma flows Peer-Reviewed Publication. Science China Press ...

To make their discovery, researchers combined different tracers of the centripetal acceleration found in different types of galaxies, from which they made 1-to-1 comparisons.