vacuum-effects

Updated: May 27, 2025

There may, further, be cases where the effects of luminous radiative repulsion become apparent, and also Crookes' vacuum-effects described as "radiant matter." Nor is it quite certain that Laplace's proofs of the instantaneous propagation of gravity are final. And in the future, as in the past, Tycho Brahe's dictum must be maintained, that all theory shall be preceded by accurate observations.

George Forbes - History of Astronomy