  The next generation of space-based experiments will go hunting for answers to
cosmology's key open questions which revolve around inflation, dark matter and
dark energy. Low earth orbit and lunar missions within the European Space
Agency's Human and Robotic Exploration programme can push our knowledge forward
in all of these three fields. A radio interferometer on the Moon, a cold atom
interferometer in low earth orbit and a gravitational wave interferometer on
the Moon are highlighted as the most fruitful missions to plan and execute in
the mid-term.
