(andrey_l/Shutterstock) Time travel is a dream shared by pretty much all of us. But the dearth of visitors from the future – and the dismal turnout at the famed time traveler party – is alarming for ...

A photon emitted from a star a billion light-years away arrives at a telescope having experienced no time whatsoever. Not very little time. None. That result is not a loose approximation or a poetic ...