WASHINGTON — The Space Force is eyeing innovative in-orbit refueling technology, but a key question lingers: is it worth the cost, especially when the military is considering a shift towards cheaper, ...

The following is an extract from our Lost in Space-Time newsletter. Each month, we hand over the keyboard to a physicist or two to tell you about fascinating ideas from their corner of the universe.

Most of today’s leading theoretical physicists have a shared perspective about what the next revolution in physics will look like. They think reconciling Albert Einstein’s general theory of relativity ...