Jim Ledwith returns to lead the ninth annual UFO Lecture Series at the Sonoma Community Center next week.

On Monday, Nov. 6, Ledwith will explore “Planet Serpo – The Human/Alien Exchange Program.”

“Close Encounters of the Third Kind” celebrated its 40th anniversary this year. Ledwith has researched two unexplained topics covered in the film, Planet Serpo and the Bermuda Triangle. On Monday he will discuss Planet Serpo, 39 light years from Earth, and explain the exchange program footage that appears in “Close Encounters.”

The program will also include a discussion with researcher Len Kasten, author of “Secret Journey to Planet Serpo — A True Story of Interplanetary Travel.”

The program, open to all ages, runs from 7 to 9 p.m on Monday, Nov. 6. Tickets are $10 general, $5 youth. 276 E. Napa St. 938.4626. Svbo.org.