Time travel may be a staple of science fiction, but physics tells a more complicated story, one that’s still unfolding.

Physical equations enable us to predict the future, but singularities imply a lack of predictability; theory just breaks down ...

MORE: Exoplanet discovered in 2020 has the coldest temperatures ever measured, scientists say. The researchers used a ...

There are new hints that the fabric of space-time may be made of "memory cells" that record the whole history of the universe ...