Before he died. These could lead to new research in cosmology for the next few years.
https://mashable.com/2018/03/19/stephen-hawking-multiple-universes-last-study-submitted/#eRXt8anitPqV https://mashable.com/2018/03/19/stephen-hawking-multiple-universes-last-study-submitted/#eRXt8anitPqV