Burn

catch the rocket ahead of you.

an orbital rendezvous: press slow down or speed up to burn, and dock with the target

In orbit, burning toward a target ahead raises you into a higher, slower orbit, and it pulls away. Burning backward drops you lower, where an orbit is shorter, so you overtake and rise back to meet it; then a burn the other way matches its speed. Gemini 4 learned this in 1965 by thrusting toward its rocket stage and watching it recede.

Concepts: orbits, physics.

An interactive you play with one thumb, on Wundr.