Probe
From Kerbal Space Program Wiki
Probes are spacecraft built around probe cores (unmanned command modules). They can be used to control rockets and other systems, perform experiments, and to provide other functionality, all controlled remotely, where Kerbanauts could not or should not go.
![](/images/thumb/8/8e/IPSP_orbit.png/300px-IPSP_orbit.png)
A probe in an orbit around Kerbin