How do we know the speed of light – and why does it have a speed limit at all? Leah Crane explores the history of one of the most important numbers in the universe ...

Albert Einstein, everyone’s favorite wild-haired genius with a mischievous grin, is more than just a pop culture icon whose legend lives on today. He’s arguably the most influential scientist of the ...

Two Caltech historians associated with the Einstein Papers Project have gathered together what they consider to be the most important of Einstein's ...

Theoretical physicist Alex Lupsasca is pushing for a space telescope to glimpse the thin ring of light that is thought to surround every black hole.