UET Science Society - You'd launch a Von Neumann probe (that is, a spacecraft that can replicate itself) equipped with an interstellar propulsion system and send it to a neighboring star system.
![Aliens have already invaded earth on self-replicating space-ships, scientist claims | Science | News | Express.co.uk Aliens have already invaded earth on self-replicating space-ships, scientist claims | Science | News | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/151/590x/1193947_1.jpg)
Aliens have already invaded earth on self-replicating space-ships, scientist claims | Science | News | Express.co.uk
Von Neumann machines are self-replicating space probes sent out to multiply and explore the universe. Any advanced alien civilization would have such probes, so does the fact that we haven't yet seen
An Optical Probe for Real-Time Monitoring of Self-Replicator Emergence and Distinguishing between Replicators | Journal of the American Chemical Society
![Maybe Self-Replicating Robot Probes are Destroying Each Other. That's Why We Don't See Them - Universe Today Maybe Self-Replicating Robot Probes are Destroying Each Other. That's Why We Don't See Them - Universe Today](https://www.universetoday.com/wp-content/uploads/2014/05/ATA-pix14-1280x720.jpg)