The most powerful "virtual telescopes" are created through . By synchronizing multiple radio telescopes across continents, scientists create a virtual dish as large as the distance between them.
A Virtual Observatory (VO) is not a physical instrument but a web-based research environment that allows astronomers to "interrogate" vast archives of astrophysical data.
This is the most famous example, linking eight observatories on four continents to form a single Earth-sized virtual telescope .