Diagram of a the future looking portion of a lightcone
light·cone
/ˈlītkōn/ | noun | Physics
A conceptual representation in spacetime of all possible paths that light rays emanating from a single event could take, forming a cone-shaped region in a four-dimensional space-time diagram.
Usage

"As intelligence explodes and we contemplate the future of life amongst the stars, we must consider how to maximize our impact within the constraints of our future lightcone."