We are entering an extremely data-rich era in the next decade,
with full 6D+chemistry information on dozens of stellar streams, to
shape our understanding on the chemo-dynamical evolution of the
Milky Way, as well as the nature of the dark matter...
The key word in the title is “IN”. Unlike AdS where observers
can be thought of as living on the boundary of space, or even in a
laboratory beyond the boundary, in dS the observer is part of the
system; he or she lives “in” the de Sitter spacetime...