UNSW astronomers have shown that binary stars – two stars locked in orbit around each other – reflect light as well as radiating it, revealing new ways for their detection. One of the first things we learn in astronomy is that some of the objects in the sky (the Sun and the stars) produce their own light, whereas others (the Moon and the planets) are only visible because they reflect light from the Sun. But do the Sun and the stars also reflect some of the light that falls on them? This is a question that scientists from UNSW Sydney...