3 ms·
Gravity can stretch spacetime to make the distance light has to travel longer than in an unaltered "flat" universe. But can it also shrink, causing a photon to
by whoopdedo 10y ago
Gravity can stretch spacetime to make the distance light has to travel longer than in an unaltered "flat" universe. But can it also shrink, causing a photon to arrive at a destination in a shorter time? And I don't mean a wormhole, which requires tearing in a topological sense.