School on Gravity 2026 · Day 2 · From Motion to Commotion

Hunting for Black Holes & Neutron Stars

Two decks: the tell-tale phenomena that reveal compact objects, and the observatories we hunt them with. Your task: figure out which instruments can catch your phenomena — and how.

Each group gets one to two object cards (e.g. “A1 & D3”). What signal are you looking for to observe your phenomena? Which observatories could detect it, and what would they measure? Stuck on the signal? Hit Show hint on the card. Click an observatory card to see its specs. Finished early? Grab an extra card.