Hi, I’m Dr. Bonnie Buratti, and I’ve worked at NASA’s Jet Propulsion Laboratory for 35 years. Most recently I’ been on the following missions: Cassini to Saturn, New Horizons to Pluto, and Rosetta to a comet. I’m interested in what planets are made of and what it would be like if we just stood on their surfaces. I’m fascinated by all the exotic things we’ve found – sulfur volcanoes on Io, methane lakes on Titan, polar caps of dry ice on Mars, and nitrogen glaciers on Pluto. I’d like to share my excitement about what we’ve found with you. I just published a book, “Worlds Fantastic, Worlds Familiar”, that is a personal guide through the Solar System. I describe how landforms on the planets are similar to those on the Earth, only often more fantastic. I’ll be back at 2 pm ET (11 am PT) to answer your questions, ask me anything! edit: 1:28 PM PST - Thank you to the entire /r/science community for your participation and thoughtful questions. I would also like to thank the mods for their great stewardship and seamless setup (especially Nate).