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 ...

Watch all new episodes of Ancient Aliens returning soon, and stay up to date on all of your favorite History Channel shows at https://history.com/schedule. Billions of years ago, asteroids hitting Earth deposited metals crucial to technological advancement. Could we find even more of these ...