Astronomers know that planets around other stars beyond the Solar System are common. But these planets are very hard to see and even harder to study. Fortunately, there is a clever trick that helps to separate the feeble glow of a planet from the dazzling glare of its parent star: exploiting the polarisation of the light reflected from the planet. <br /><br />In this episode of the ESOcast we'll talk about this very special feature of light and how we can use it to detect planets around other stars. <br /><br />Credit: ESO
