We take for granted, today, that the Universe is transparent to light, and that the light from distant objects can travel unimpeded through space before reaching our eyes. But it wasn't always ...

But while your PJs may be opaque to the prying eyes of your neighbors, they are quite transparent to radio signals, cosmic rays or neutrinos. (Even a light-year’s worth of solid lead is ...

The new technology may one day be useful for harvesting energy, while remaining transparent to light and using a single material. What happens when you expose tellurite glass to femtosecond laser ...

If there’s one thing you can be certain about when it comes to outer space, it’s that it’s transparent, not opaque, to light. When you gaze up at a dark night sky, you aren’t restricted to ...