plural of cosmological horizon

plural of particle horizon

plural of rational horizon

plural of time horizon

plural of radar horizon

plural of Cauchy horizon

plural of marker horizon

(idiomatic) To increase someone's interests, skills, or experiences beyond their current range.

plural of cosmic event horizon

(astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light. / (by extension) A point of no return.