Aliens - 10 Ways We Could Get Messages From Advanced Aliens

 Plain Old Radio Waves
 Lasers, Of Course
 Starlight
 Dyson Spheres Or Dyson Swarm
 Playing With The Cosmos
 Gravitational Waves
 Bombard Us With High-Energy Particles
 Erasing Large Things From Existence
 Wormholes
 Change The Laws Of Physics