Guests: John Batchelor, Dr. Alan Hale,  Dr. David Livingston.  Topics:  Comets and their origins, Comet ZTF in the sky at this time.

Guests: John Batchelor, Dr. Karen Meech, Dr. David Livingston.  Topics:  Interstellar comets Borisov and Oumuamua, comets in general and more. You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright.

Guest:  Dr. Jay Melosh; Topics: Asteroids, comets, planetary defense, impact craters, dinosaurs & their death, planetary geology and geologic violence. 

Guests: John Batchelor, Dr. Andrew Siemion, Dr. David Livingston.  Topics:  Tabby's Star: What is it?;  You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright.

Guest: Dr. Martin Elvis. Topics: Asteroid mining, commercial space, NASA. Please direct all comments and questions regarding Space Show programs/guest(s) to the Space Show blog, http://thespaceshow.wordpress.com. Comments and questions should be relevant to the specific Space Show program. Written Transcripts of Space Show programs are a violation of our copyright and are not permitted without prior written consent, even if for your own use.