Figure 2.

Space Habitats (artists’ concepts)

Unmanned probe approaching Pluto. Probe is powered by thermionic radioisotope power generator. The laser beams for surface illumination, with optical sensors slaved to the beams. Other equipment comprises radiation counters as well as field, plasma and particle sensors.

Image credit: Krafft Ehricke Papers
Image source: NASM

Voyager

Image credit: Lockheed
Image source: Mike Acs

Viking by Russ Arasmith

Image credit: NASA
Image source: Mike Acs