In this week's live Questions and Answers show, I provide the exact number of alien worlds that could detect the Earth, are we made of heavier elements made in other galaxies, will lasers remain perfectly parallel in space? And more... To vote for the best question just post any comment ...

Looking up at the night sky and its beauty can be baffling and intriguing experience for many. But aside from this beauty, there can be something scary out there? Or maybe not scary. As Arthur C. Clarke said, “We are either alone in this universe or we are not. What if we are being watched by ...