Episode Links: MESSENGER Spacecraft and Instruments (https://www.nasa.gov/mission_pages/messenger/spacecraft/index.html) MESSENGER Overview (https://www.nasa.gov/mission_pages/messenger/whymessenger/index.html) PDF- MESSENGER Mission Information (https://www.nasa.gov/pdf/525164main_MercuryMOI_PK.pdf) MESSENGER: In Depth (https://solarsystem.nasa.gov/missions/messenger/indepth) NASA Completes MESSENGER Mission with Expected Impact on Mercury's Surface (https://www.nasa.gov/press-release/nasa-completes-messenger-mission-with-expected-impact-on-mercurys-surface)