  This chapter of the Planetary Exploration Horizon 2061 Report reviews the way
the six key questions about planetary systems, from their origins to the way
they work and their habitability, identified in chapter 1, can be addressed by
means of solar system exploration, and how one can find partial answers to
these six questions by flying to the different provinces to the solar system:
terrestrial planets, giant planets, small bodies, and up to its interface with
the local interstellar medium. It derives from this analysis a synthetic
description of the most important space observations to be performed at the
different solar system objects by future planetary exploration missions. These
observation requirements illustrate the diversity of measurement techniques to
be used as well as the diversity of destinations where these observations must
be made. They constitute the base for the identification of the future
planetary missions we need to fly by 2061, which are described in chapter 4.
Q1- How well do we understand the diversity of planetary systems objects? Q2-
How well do we understand the diversity of planetary system architectures? Q3-
What are the origins and formation scenarios for planetary systems? Q4- How do
planetary systems work? Q5- Do planetary systems host potential habitats? Q6-
Where and how to search for life?
