Automation

Attack automation: one of your planets keeps sending its whole stockpile to a target whenever it builds up to a threshold you choose. The range is 100 to 10,000 probes for both planet and sun targets, since probes sent at a sun convert to super-probes on arrival. Set it up by holding SPACE while dragging, or from the radial menu: toggle Auto, then drag the dial to pick the threshold and release.

Sun attack automation: the same idea for suns. A source sun forwards its super-probes to another sun as soon as it has any, which is handy for relaying reinforcements toward the front. Pointed at a black hole instead, it fires once it reaches a threshold you pick (100 to 10,000 super-probes), which then convert to megaprobes on arrival.

Upgrade automation: a planet upgrades itself as soon as it has enough probes, so your empire keeps growing while you are away.