Whether or not aliens exist, the SETI program has never stopped believing. Yet today, radio telescopes are no longer seen as the best way to ...

Researchers have found that under certain conditions, a laser beam can act like an opaque object and cast a shadow, opening new possibilities for technologies that could use a laser beam to control ...

Neutrino lasers: It’s an idea that many physicists didn’t see coming. At first glance, physics suggests that it would be impossible to make a laser of neutrinos, famously elusive subatomic particles.

Those models give the simulated laser beam its own shadow because they treat it as a solid object instead of a ray of light. During a lunchtime conversation about this quirk of the modeling system, ...

Researchers have built a paper-thin chip that converts infrared light into visible light and directs it precisely, all without mechanical motion. The design overcomes a long-standing efficiency-versus ...