Weekly Challenge #42: Discovery Tour

Primary: In one launch, visit at least two discoverables, not on Kerbin, and plant flags at them before returning to Kerbin.

Secondary: Same, but plant flags at three discoverables.

Jeb: Visit these three discoverables on at least two different celestial bodies.

Val: Each of the three discoverables you visit must be on a different celestial body (not Kerbin).