Science & Reason: http://tinyurl.com/ScienceReason Our Galaxy, The Milky Way – Best of Carl Sagan’s Cosmos (Part 4). — Please subscribe to Science & Reason: • http://www.youtube.com/Best0fScience • http://www.youtube.com/ScienceMagazine • http://www.youtube.com/ScienceTV • http://www.youtube.com/FFreeThinker • http://www.youtube.com/SagansCosmos — BEST OF CARL SAGAN’S “COSMOS”: 1) 10 Years After: Carl Sagan & Ann Druyan Reflect:…