PLANETARY EXPLORATION NEWSLETTER Volume 19, Number 49 (December 7, 2025) PEN Website: https://planetarynews.org Editor: Matthew R Perry Co-Editors: Mark V. Sykes, Alex Morgan Email: pen_editor@psi.edu X: @pen2tweets BlueSky: @planetarynews.bsky.social o-------------------------TABLE OF CONTENTS---------------------------o 1. Planetary Geomorphology Image of the Month 2. 3 Year Postdoctoral Position in Mars Glaciology - Sheffield, UK 3. [AbSciCon 2026] Session 47: Redox Reactions and Habitability on Earth, Mars and Beyond 4. [AbSciCon 2026] Session 61: Enceladus - Active, Enigmatic and Irresistible 5. [AbSciCon 2026] Session 63: From Subsurface to Surface and Plume - How Ejection Affects Erupted Material on Icy Ocean Worlds 6. [AbSciCon 2026] Session 88: Exploring Self-assembly and Self-organization - From Prebiotic Molecules to the Emergence of Organic Complexity and Implications Towards the Future Exploration of Ocean Worlds 7. Ariel: Science, Mission & Community Conference 2026 - Abstract Submission Open 8. Mercury Science Goals Document Released 9. Geospatial Scientist Position with GeoControl Systems at NASA-JSC 10. Europlanet Juice Webinar: Radar Sounding of the Earth's Polar Regions and the Jovian Icy Moons 11. [AGU 2025] FLOW Event for Early Career Scientists: Tuesday, 16 December at 6 PM 12. [NASA] SMD: ROSES-25 - F.10 PRISM Correction and FAQ Posted 13. [NASA] PDS: Aperiodic PDS Data Releases in 2025.11 14. [NASA] PDS: Mars 2020 Mission Release 14 15. [NASA] PDS: Mars Reconnaissance Orbiter Data Release 75 16. [NASA] PDS: Mars Science Laboratory Release 40 17. Planetary Meeting Calendar Additions 18. Planetary Science Journal - New Papers 19. Journal of Geophysical Research: Planets - New Papers o---------------------------------------------------------------------o 1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1 PLANETARY GEOMORPHOLOGY IMAGE OF THE MONTH The December image of the month is now available on the IAG's Planetary Geomorphology web page: https://planetarygeomorphology.wordpress.com This month's topic is 'Investigating the formation of Dust Devils on Mars', contributed by Quentin Betton (master student) & Dr. Susan Conway - LPG Nantes You can follow IAG Planetary Geomorphology Image of the Month on BlueSky: @planetarygeomorph.bsky.social or Facebook: https://www.facebook.com/PlanetaryGeomorphology Best wishes, Lonneke Roelofs (Chair, IAG Planetary Geomorphology working group) 2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2 3 YEAR POSTDOCTORAL POSITION IN MARS GLACIOLOGY - SHEFFIELD, UK We are hiring a 3-year postdoctoral research associate in Mars glaciology at the University of Sheffield in the UK. We are seeking applicants with a background in Glaciology or Mars geomorphology to combine GIS-based mapping of Martian glaciers with either: a) Numerical ice flow modelling experiments, for example using the Ice Sheet and Sea Level System Model (ISSM) or a similar model. and/or b) The development of automated (e.g., deep learning) approaches to mapping and classification of glacier-surface morphologies and other ice-related terrains on Mars. Applications are welcomed from individuals with relevant experience in terrestrial glaciology. The 3-year role forms part of a Royal Society University Research Fellowship grant (2025-2033) led by Frances Butcher, entitled "Unlocking Martian Climate Archives: The Glaciological Groundwork for the First Ice Cores from Mars". The description of the role, and application information can be found here: https://www.jobs.ac.uk/job/DPR111/research-associate-in-mars-glaciology Applications will close on 19 January 2026. Please feel free to send enquiries via email. Many thanks Frances Butcher, University of Sheffield 3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3 [ABSCICON 2026] SESSION 47: REDOX REACTIONS AND HABITABILITY ON EARTH, MARS AND BEYOND Abstract Deadline: 23:59 EST/03:59 UTC on 14 January 2026. Session Link: https://agu.confex.com/agu/abscicon26/prelim.cgi/Session/275767 Redox (reduction-oxidation chemistry) reactions fundamentally shape planetary habitability by controlling energy availability, atmospheric composition, and biogeochemical cycling. This session explores how redox chemistry influences habitability across diverse planetary environments, from Earth to Mars and other worlds. We invite contributions from geochemistry, microbiology, remote sensing, and atmospheric chemistry that examine redox processes in any planetary context. Topics may include: redox gradients as energy sources for life, records of redox conditions in ancient environments, oxidant production and consumption in planetary atmospheres and surfaces, mineral-mediated electron transfer, potential biosignatures linked to redox cycling such as recent discoveries on Mars by the Perseverance rover, and the co-evolution of life and planetary redox states. We particularly encourage submissions that compare redox environments across multiple worlds, integrate laboratory and field observations with planetary data, or connect microscale redox reactions to planetary-scale habitability. Conveners: Melissa Rice, Adrian Broz 4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4 [ABSCICON 2026] SESSION 61: ENCELADUS: ACTIVE, ENIGMATIC AND IRRESISTIBLE Abstract Deadline: 23:59 EST/03:59 UTC on 14 January 2026. Session Link: https://agu.confex.com/agu/abscicon26/prelim.cgi/Session/275238 Saturn's moon Enceladus is a geologically active and habitable ocean world, offering fresh opportunities to search for signatures of potential extant life. The most accessible ocean material beyond Earth erupts from the internal plumbing system of Enceladus, forming a plume that modifies the space environment at Saturn. We welcome the community to submit contributions focusing on astrobiology and enabling processes, including but not limited to: life detection approaches, organic chemistry, plume formation and eruption mechanisms, cryovolcanism, ice fracturing and other tectonic processes, ocean circulation, water-rock reactions, tidal heating, Enceladus's formation, history, and internal structure, and cross comparisons with other ocean worlds including Earth and Europa. Observational, theoretical, laboratory, and field analogue investigations are all welcome. Conveners: Morgan Cable, Amanda Hendrix, Sarah Johnson, Cynthia Phillips 5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5 [ABSCICON 2026] SESSION 63: FROM SUBSURFACE TO SURFACE AND PLUME - HOW EJECTION AFFECTS ERUPTED MATERIAL ON ICY OCEAN WORLDS Abstract Deadline: 23:59 EST/03:59 UTC on 14 January 2026. Session Link: https://agu.confex.com/agu/abscicon26/prelim.cgi/Session/275183 Several icy moons and dwarf planets display evidence of volcanic activity. Such cryovolcanism can express material from subsurface liquid reservoirs onto the surface or in plumes, where it can be observed and accessed by spacecraft. Although eruption provides an opportunity to assess the habitability and presence of life in subsurface environments, the temperature, pressure and phase changes undergone by erupted material can alter its properties that are crucial to astrobiological investigation of the subsurface. This session welcomes contributions based on -or combining- theoretical, experimental, mission data analysis, or field work to further the understanding of linkages between properties of surface or plume materials and those of their subsurface source, particularly those properties related to habitability and the search for life. Conveners: Marc Neveu, Wanying Kang, Lucas Fifer, & Mariam Naseem 6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6-6 [ABSCICON 2026] SESSION 88: EXPLORING SELF-ASSEMBLY AND SELF-ORGANIZATION - FROM PREBIOTIC MOLECULES TO THE EMERGENCE OF ORGANIC COMPLEXITY AND IMPLICATIONS TOWARDS THE FUTURE EXPLORATION OF OCEAN WORLDS Abstract Deadline: 23:59 EST/03:59 UTC on 14 January 2026. Session Link: https://agu.confex.com/agu/abscicon26/prelim.cgi/Session/275178 A central challenge in astrobiology is to understand how chemical reactions made the transition from simple molecular building blocks to the first biological entities. This session invites contributions that examine this critical step-from the self-organization of simple organic molecules into complex reaction networks, abiotic micelles, vesicles, and protocells, to the emergence of the first cells. By bridging experimental chemistry, systems biology, and planetary science, the session aims to highlight cross-disciplinary pathways for information transfer, energy exchange, and the rise of cellularity under conditions considered habitable. We welcome recent and ongoing advances spanning laboratory experiments, fieldwork and modeling with specific applications for biosignature detections on ocean worlds within our Solar System and on exoplanets. Conveners: Anastasia Yanchilina, Jessica Weber, Silke Asche, and Alexandre Champagne-Ruel. 7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7-7 ARIEL: SCIENCE, MISSION & COMMUNITY CONFERENCE 2026 - ABSTRACT SUBMISSION OPEN Registration and Abstract submission for the Ariel: Science, Mission & Community Conference 2026 are now open at: https://arielmission.space/index.php/ariel-open-conference-2026/ The international scientific community is cordially invited to attend the Ariel Open Conference 2026, 17-19 March 2026 at ESA/ECSAT, Harwell Campus, Didcot, UK, hosted at the ESA Magali Vaissiere Conference Centre, in the Harwell Campus in the UK. Sessions will include: - The ESA Ariel Mission, Science, Targets and Mission properties - Discs & Planet Formation - Properties of Host Stars & Star-Planet interactions - From the Solar System to exoplanets - Atmospheric models & observations - Interiors & connection to atmospheres - Synergies with other missions and observatories - Complementary Science and Community Engagement - AI, Data challenges and community tools Abstracts for Contributed Talks can be submitted until Friday, December 12, 2025. Abstracts for Posters can be submitted until Sunday, February 15, 2026. We look forward to seeing you at the conference in March 2026! Giovanna Tinetti on behalf of the SOC 8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8 MERCURY SCIENCE GOALS DOCUMENT RELEASED The Science Goals document of the Mercury Exploration Assessment Group (MExAG) is released! The document can be accessed at: https://www.lpi.usra.edu/mexag/documents/ This document was developed by the Mercury community to capture and communicate the community's scientific priorities and goals for understanding and exploring Mercury. The intended audiences for the document are: (1) NASA, as a means for communicating the community-driven goals, and (2) the planetary science community, as a mechanism of sharing knowledge about important themes for understanding and exploring Mercury. 9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9-9 GEOSPATIAL SCIENTIST POSITION WITH GEOCONTROL SYSTEMS AT NASA-JSC The Geospatial Scientist will: - Employ GIS and remote sensing techniques to Earth, Moon, and other planetary image data in support of International Space Station (ISS) and Artemis missions - Provide science services and technology products to a range of human exploration organizations including Gateway, Orion, the lander/ascent systems, spacesuits, EVA, and ISS - Interact with scientists, engineers, and managers in a highly dynamic and occasionally time critical environment - Develop funding proposals for submission to relevant scientific and technology grant solicitations opportunities - and more... Details: https://geocontrol.zohorecruit.com/jobs/Careers/460115000020348052 10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10 EUROPLANET JUICE WEBINAR: RADAR SOUNDING OF THE EARTH'S POLAR REGIONS AND THE JOVIAN ICY MOONS 11 December at 15:30 CET (14:30 UTC) Radar sounders can penetrate ice to depths of several kilometers and play a crucial role in studying the subsurface of the Earth and other planetary bodies. Extensive experience has been gained from air-borne radar sounders dedicated to Earth observation. The ESA Juice mission is carrying the Radar for Icy Moons Exploration (RIME) instrument. This presentation will outline the current status of radar sounding for Earth observation and its connection to RIME's science, highlighting the key scientific objectives, technical challenges, and expected scientific returns of the exploration of the Jupiter icy moons. The talk will be presented by Lorenzo Bruzzone, the PI of RIME, from the University of Trento, Italy. Please register at this link: https://tinyurl.com/3k5cepeu 11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11-11 [AGU 2025] FLOW EVENT FOR EARLY CAREER SCIENTISTS: TUESDAY, 16 DECEMBER AT 6 PM Students and early career scientists who are attending AGU are invited to attend a social event hosted by FLOW, the Future Leaders of Ocean Worlds group. The meet up will be Tuesday, 16 December from 6 to 7pm at the Grille and Bar at the Hilton Garden Inn, conveniently located just a 3-minute walk from Ernest Morial Convention Center in New Orleans: https://tinyurl.com/FLOWAGU26 You can RSVP by filling out this sheet. Please write your name, presentation information (optional), and check yes for "meet up": https://tinyurl.com/4tpjrfvc FLOW officers will have name tags and a sign, so you can find us at the bar. We are excited to meet you and enjoy the time together with fellow ECRs interested in ocean worlds! 12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12-12 [NASA] SMD: ROSES-25 - F.10 PRISM CORRECTION AND FAQ POSTED F.10 Payloads and Research Investigations on the Surface of the Moon (PRISM) solicits development and flight of a science-driven suite of instruments and supporting technology demonstration payloads tailored to complete scientific investigations at a lunar landing destination, that address the science goals of 1) any SMD division, 2) objectives of the Exploration Systems Development Mission Directorate, and 3) any technology demonstration goals of the Space Technology Mission Directorate that advance capabilities for science, exploration, or commercial development of the Moon. This email is to notify potential proposers to F.10 PRISM that 1) a bullet was added to the list of information in Section 4.1 that proposers must provide if leveraging survive-the-night services, and 2) the FAQ has been updated. The PRISM pre-proposal conference was held on Friday, December 5 at 1 pm Eastern Time (UTC-04:00). For more information on F.10 PRISM, please visit: https://tinyurl.com/NASAPRISM2025 13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13-13 [NASA] PDS: APERIODIC PDS DATA RELEASES IN 2025.11 In November 2025, PDS made available the following data: - 2025-11-05 DART SPICE Release 4 MAVEN: - 2025-11-25 LPW-associated products - 2025-11-03 Insitu Key Parameters Data Lucy: - 2025-11-20 L'TES Donaldjohanson Calibrated - 2025-11-18 L'Ralph LEISA Donaldjohanson Release - 2025-11-18 Mission Document Collection v2.0 - 2025-11-18 Radio Science Donaldjohanson Release - 2025-11-18 TTCam Donaldjohanson Raw and Calibrated - 2025-11-18 L'TES Donaldjohanson Raw - 2025-11-18 L'LORRI Didymos v2.0 and Donaldjohanson releases - 2025-11-18 L'Ralph MVIC Donaldjohanson Release - 2025-11-04 SPICE Release 2 New Horizons: - 2025-11-18 Documents for the LORRI Instrument v2.0 - 2025-11-18 Spacecraft Trajectory v2.0 Voyager 2: - 2025-11-14 Uranus Cosmic Ray Subsystem Data - 2025-11-14 Saturn Cosmic Ray Subsystem Data - 2025-11-06 Neptune Cosmic Ray Subsystem Data Mars Express: - 2025-11-04 VMC Calibrated Data - 2025-11-04 VMC Raw Data - 2025-11-04 OMEGA Flight EDRs during extext9 - 2025-11-04 SPICAM 4 UV Atmospheric Profiles v1.0 - 2025-11-04 SPICAM 4 IR Atmospheric Profiles v1.0 - 2025-11-04 PFS atmospheric water vapour column maps - 2025-11-04 OMEGA-derived water ice cloudiness - 2025-11-04 OMEGA 4 Atmospheric Profiles V1.0 - 2025-11-04 HRSC 4 Mesospheric Clouds v1.0 To access those data: https://pds.nasa.gov/datasearch/subscription-service/SS-20251130.shtml [Edited for length] 14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14-14 [NASA] PDS: MARS 2020 MISSION RELEASE 14 The NASA Planetary Data System announces Release of data from the Mars 2020 Perseverance Rover mission to Mars. This release contains raw, calibrated, and derived data products covering sols 1260-1379 of the mission, September 5, 2024, through January 5, 2025. The data are archived at various PDS Nodes. Links to all the archives can be found at: https://pds-geosciences.wustl.edu/missions/mars2020/index.htm Data from the following science investigations are included in this release: - Mastcam-Z - Mast-mounted Zoom Camera System - Engineering Hazard and Navigation Cameras - EDLCam - Entry, Descent, and Landing System Cameras - Helicopter Cameras - MEDA - Mars Environmental Dynamics Analyzer - PIXL - Planetary Instrument for X-ray Lithochemistry - RIMFAX - Radar Imager for Mars Subsurface Exploration - SHERLOC - Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals - SuperCam - LIBS, Raman, Time-Resolved Fluorescence, VIS/IR spectrometers, Remote Micro-Imager and microphone - SPICE - Observation geometry and ancillary data To access the latest PDS Data Releases, please visit the following link: https://pds.nasa.gov/datasearch/subscription-service/SS-Release.shtml All available PDS data may be found at: https://pds.nasa.gov/datasearch/data-search/ For further information, see the PDS Home Page: https://pds.nasa.gov/ 15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15-15 [NASA] PDS: MARS RECONNAISSANCE ORBITER DATA RELEASE 75 The NASA Planetary Data System announces Release 75 of data from the Mars Reconnaissance Orbiter (MRO). This release contains raw, calibrated, and derived data products nominally covering the time period February 9 through May 8, 2025. Some instrument teams are delivering more recent data. The data are archived at various PDS nodes. - CRISM, SHARAD, and Radio Science data at the Geosciences Node - HiRISE, CTX, and MARCI data at the Cartography and Imaging Sciences Node - MCS data at the Atmospheres Node - SPICE data at the NAIF Node For a view centered on this release: https://pds.nasa.gov/datasearch/subscription-service/SS-20251201.shtml The data may also be accessed at: https://pds-geosciences.wustl.edu/missions/mro/ To access the latest PDS Data Releases, please visit the following link: https://pds.nasa.gov/datasearch/subscription-service/SS-Release.shtml All available PDS data may be found at: https://pds.nasa.gov/datasearch/data-search/ For further information, see the PDS Home Page: https://pds.nasa.gov/ MRO data releases occur every three months. The next release is scheduled for February 27, 2026 16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16-16 [NASA] PDS: MARS SCIENCE LABORATORY RELEASE 40 The NASA Planetary Data System announces Release 40 of data from the Mars Science Laboratory (Curiosity) mission. This release contains raw and derived data products covering sols 4489 through 4612, March 22, 2025 - July 28, 2025. The data are archived at various PDS nodes. Links to all the archives can be found at: https://pds-geosciences.wustl.edu/missions/msl/index.htm or for a dataset-oriented perspective: https://pds.nasa.gov/datasearch/subscription-service/SS-20251205.shtml Data from the following science investigations are included directly in this release: - APXS, ChemCam, CheMin (raw), DAN, RAD, REMS, SAM, SPICE while these investigations are delayed: - CheMin (derived), Engineering Cameras, MAHLI, MARDI, Mastcam, PLACES The next MSL release is scheduled for March 17, 2026. 17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17-17 PLANETARY MEETING CALENDAR ADDITIONS Note: Many face-to-face meetings going forward will have online components. Check their websites for details. Posted at https://planetarynews.org/meetings.html January 6-8, 2026 2025 Annual Meeting of the Lunar Exploration Analysis Group (LEAG) https://www.hou.usra.edu/meetings/leag2025/ Laurel, MD January 13-14, 2026 Small Bodies Assessment Group (SBAG) Meeting https://www.lpi.usra.edu/sbag/meetings/sbagjan2026/ Baltimore, MD March 16-18, 2026 Exploring the Intersection of Science and Instrumentation with ERIS and HARMONI https://www.roe.ac.uk/workshop/eris-harmoni/ Edinburgh, United Kingdom March 17-19, 2026 Ariel: Science, Mission & Community 2026 https://arielmission.space/index.php/ariel-open-conference-2026/ Didcot, United Kingdom April 13-16, 2026 Science with the Hubble and James Webb Space Telescopes VIII: Enriching the Universe - From Primordial Nucleosynthesis to Exoplanet Atmospheres https://tinyurl.com/m2jt6dte Vienna, Austria April 14-16, 2026 Mapping and Planetary Spatial Infrastructure Team (MAPSIT) https://www.lpi.usra.edu/mapsit/meetings/april2026/ Houston, TX May 11-15, 2026 Meteorites and the Early Solar System III https://astrobiology.arizona.edu/meteorites-and-early-solar-system-iii Copenhagen, Denmark July 5-10, 2026 Radio Telescopes, Techniques, and Methods/SPIE Astronomical Telescopes + Instrumentation https://tinyurl.com/5ef7u85s Copenhagen, Denmark 18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18-18 PLANETARY SCIENCE JOURNAL - NEW PAPERS Direct Links to Open Access Papers Editor, Faith Vilas https://psj.aas.org Effect of Regolith-Ice Stratigraphy and Laser Weathering on Ultraviolet-Visible-Near-infrared Detection of Lunar Water Ice Abhay Vidwans and Jeffrey Gillis 2025 PSJ 6:278 https://doi.org/10.3847/PSJ/ae1baa Lake Stars as an Earth Analog for Europa's Manannan Crater Spider Feature Lauren E. Mc Keown et al. 2025 PSJ 6:279 https://doi.org/10.3847/PSJ/ae18a0 SpinTrace: A Python Library to Study the Physical Properties of Small Bodies Using Survey-based Photometry F. L. Rommel et al. 2025 PSJ 6:280 https://doi.org/10.3847/PSJ/ae1c3a JWST/NIRSpec Observations of Salacia-Actaea and Mani: Exploring Population-level Trends among Water-ice-rich Kuiper Belt Objects Ian Wong et al. 2025 PSJ 6:281 https://doi.org/10.3847/PSJ/ae1d63 Visible-infrared Spectra of keV Electron Irradiated Cryogenic Salts with Implications for Europa Surface Composition C. A. Hibbitts et al. 2025 PSJ 6:282 https://doi.org/10.3847/PSJ/ae182c 19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19-19 JOURNAL OF GEOPHYSICAL RESEARCH: PLANETS - NEW PAPERS Direct Links to Open Access (OA) Papers Editors-in-Chief, Amanda Hendrix & Debra Buczkowski https://agupubs.onlinelibrary.wiley.com/journal/21699100 Nakhlite Emplacement as Constrained by X-Ray Computed Tomography and 3D Quantitative Textural and Petrofabric Analyses Sierra R. Ramsey et al. https://doi.org/10.1029/2025JE009220 The Influence of Space Weathering on the Far-Ultraviolet Reflectance of Apollo-Era Soils C. J. Gimar et al. https://doi.org/10.1029/2025JE009304 *********************************************************************** * The Planetary Exploration Newsletter is issued approximately weekly. * Current and back issues are available at https://planetarynews.org * * To subscribe, go to https://planetarynews.org and click on Subscribe. * * An unsubscribe option is available at the end of every PEN email. Or * send an email to pen_editor@psi.edu * * Please send all replies and submissions to pen_editor@psi.edu. * Announcements and other messages should be brief with links to URLs * for extended information, including detailed descriptions for job * announcements. Title plus text is limited to 200 words. Go to * https://planetarynews.org/submission.html for complete submission * directions. * * PEN is a service provided by the Planetary Science Institute * (https://www.psi.edu) using no NASA funds. 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