December 2024 – Page 2 – My WordPress Site

LEFT: Evolution in the period ratios plane. The points are colour-coded according to their time before the close encounter. We note that the system spends almost all of its time very close to its starting location. Green oblique lines correspond the loci of the zeroth-order threeplanet MMRs. The first-order two-planet MMRs, 7:6 and 6:5, are plotted in grey. The second-order resonance 13:11 is plotted in red. Adapted from Petit et al. (2020). RIGHT: Number of resonances covering the period ratios space for equal-mass planets, with masses 10−5 M⊙. At first order, the number of resonances can be compared to the resonance optical depth ρtot. We plot the two-planet circular Hillstability limits (Petit et al. 2018) for both planet pairs in green and the predicted overlap limit for the three-planet MMRs (Eq. 2.7) in blue. Adapted from Petit et al. (2020). -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Stellar Cartography, TRAPPIST-1

Long-term Stability and Dynamical Spacing of Compact Planetary Systems

by Keith CowingDecember 29, 2024December 28, 2024

Microbiology & Virology, Microgravity, Plant Biology, Space Agriculture, Space Life Science, Space Stations

NASA SMD Issues New Space Biology Funding Opportunity

by Keith CowingDecember 29, 2024December 28, 2024

General illustration of the calibration of the distortion. The reference stars are used to adjust a bivariate polynom T that relates the positions of the detector plane to the sky positions. The motion of the target is observed using this transformation. -- astro-ph.IM

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Stellar Cartography

Experimental Tests Of The Calibration of High Precision Differential Astrometry for Exoplanets

by Keith CowingDecember 29, 2024December 28, 2024

Volvox - a multicellular green algae. Wikipedia

Biochemistry & Organic Chemistry, Biophysics, Gaia - Planetary Perspectives, Genomics, Proteomics, Bioinformatics, Microbiology & Virology, Origin & Evolution of Life

Fundamental Constraints To The Logic Of Living Systems

by Keith CowingDecember 28, 2024December 28, 2024

A small planet orbiting its host star - Grok via Astrobiology.com

Astrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Space Weather & Heliophysics, Stellar Cartography

Methods To Characterise Exoplanet Host Stars From Spectroscopy

by Keith CowingDecember 28, 2024December 28, 2024

Uranus P-T profiles plotted over H2O phase diagram.

Atmospheres, Climate, Weather, Ice Giant, Icy Worlds, Missions & Hardware, Uranus

Interior and Gravity Field Models for Uranus Suggest Mixed-composition Interior: Implications for the Uranus Orbiter and Probe

by Keith CowingDecember 28, 2024May 12, 2025

Know Thy Star Know Thy Planet 2

Astronomy & Telescopes, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Conferences and Meetings, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Stellar Cartography

Know Thy Star Know Thy Planet 2 Conference

by Keith CowingDecember 28, 2024December 28, 2024

Career Opportunities, Conferences and Meetings, Education and Outreach, Microgravity, Plant Biology, Space Agriculture, Space Life Science

Space Life Sciences Training Program Interns Present Summer Projects

by Keith CowingDecember 28, 2024

The Astrobiology Primer -- Grok via Astrobiology.com

Astrobiology (general), Astrochemistry, Astrogeology, Biosignatures & Paleobiology, Education and Outreach, Habitable Zones, Icy Worlds, NASA Astrobiology Program, Origin & Evolution of Life, Panspermia, Reports, Roadmaps, & Plans, Water/Hycean Worlds & Oceanography

The Astrobiology Primer v2.0

by Keith CowingDecember 27, 2024December 27, 2024

A schematic illustrating habitability of physical spaces as a function of physical and chemical conditions. The diagram is a simplified depiction of niche space (here three dimensions are shown – in reality, the space is an n-dimensional hypervolume) and the extent to which these niche conditions are occupied in physical spaces. The habitable space for life is enclosed within a much larger (red) space that is uninhabitable (also see Figure 4). The blue object represents habitable space that is inhabited. At the edge of this habitable and inhabited set of physical and chemical conditions is a putative yellow ‘rind’ of habitat space at the edges of life which could be inhabited by life with appropriate evolutionary innovations. Within the habitable and inhabited space there are grey shapes depicting localized physical spaces that are habitable, but uninhabited (uninhabited habitats). The purpose of the schematic is to illustrate that uninhabited, but habitable spaces exist both within physical spaces that are known to be permissive for microbial growth and potentially at the limits of life at extremes. Life, especially using technology, can establish itself in conditions away from the blue spheroid with appropriate expenditure of energy (e.g., a self-sustaining space settlement), shown as isolated blue objects in the red space. -- FEMS Microbiology Reviews

Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Extremeophiles and Extreme Environments, Fossils & Paleontology, Habitable Zones, Microbiology & Virology, Origin & Evolution of Life, Plant Biology

Where The Microbes Aren’t

by Keith CowingDecember 27, 2024December 27, 2024