In the context of general relativity, space almost is a substance. It can bend and twist and stretch, and probably the best way to think about space is to just kind of imagine a big piece of rubber that you can pull and twist and bend.
AwardsLilienfeld Prize; Eddington Medal; Dirac Prize; Gruber Prize In Cosmology; Fundamental Physics Prize; Isaac Newton Medal; Kavli Prize In Astrophysics