**5. Conclusions**

Observations of Solar System planets have been ongoing for centuries. The expanding use of probes has significantly improved knowledge of the major planets, dwarf planets, moons, the Asteroid Belt, and Kuiper Belt Objects. Although the Solar System characteristics are relatively well known, probes have not extensively studies all the planets and dwarf planets at the same level of detail. Accordingly, Venus, Neptune, Uranus, and Pluto warrant additional investigation. The dynamics of Solar System planets are also evolving as evidenced by the periodic suggestion of additional planets including the recent calculations regarding the existence of Planet Nine.

Although exoplanets are a relatively new area of study, the field is rapidly advancing with thousands of exoplanets currently catalogued. Much is to be learned about these worlds and their characteristics, and a number of new and planned probes will add to that knowledge. Although manned planetary missions are on the horizon, exoplanet investigations will require remote approaches for the foreseeable future.
