In this week's questions show, I explain why I've got such a skeptical view about the search for aliens if there might be multiple great filters, and why NASA doesn't just go back and use Apollo hardware to return to the Moon? Follow Dr. Wright on Twitter:https://twitter.com/astro_wright00:40 Are there multiple Great Filters? 02:35 Could we refuel ships in space to land on Mars06:01 Could we put a light on the Moon to prove what we landed there? 16:03 Why don't we just use Apollo hardware to go back to the Moon? I gather a bunch up each week and answer them here.