Panspermia

Microbial Contamination: Sample Return from Mars Moons: Departure of Microbes From Mars' Surface

Microbial Contamination: Sample Return from Mars Moons: Departure of Microbes From Mars' Surface

Potential microbial contamination of Martian moons, Phobos and Deimos, which can be brought about by transportation of Mars ejecta produced by meteoroid impacts on the Martian surface, has been comprehensively assessed in a statistical approach, based on the most probable history of recent major gigantic meteoroid collisions on the Martian surface.

Terraforming

Enabling Martian Habitability With Silica Aerogel Via the Solid-state Greenhouse Effect

Enabling Martian Habitability With Silica Aerogel Via the Solid-state Greenhouse Effect

The low temperatures and high ultraviolet (UV) radiation levels at the surface of Mars today currently preclude the survival of life anywhere except perhaps in limited subsurface niches.

Mars

Geochemistry Constrains Global Hydrology On Early Mars

Geochemistry Constrains Global Hydrology On Early Mars

Ancient hydrology is recorded by sedimentary rocks on Mars. The most voluminous sedimentary rocks that formed during Mars' Hesperian period are sulfate-rich rocks, explored by the Opportunity rover from 2004-2012 and soon to be investigated by the Curiosity rover at Gale crater.

Astrochemistry

Molecular Complexity In The Interstellar Medium

Molecular Complexity In The Interstellar Medium

The search for complex organic molecules in the interstellar medium (ISM) has revealed species of ever greater complexity.

Mars

Microbial Contamination: Sample Return From Mars Moons: The Fate of Microbes on Martian Moons

Microbial Contamination: Sample Return From Mars Moons: The Fate of Microbes on Martian Moons

This paper presents a case study of microbe transportation in the Mars-satellites system. We examined the spatial distribution of potential impact-transported microbes on the Martian moons using impact physics by following a companion study (Fujita et al.).

Astrochemistry

Organic Complexity In Protostellar Disk Candidates

Organic Complexity In Protostellar Disk Candidates

We present ALMA observations of organic molecules towards five low-mass Class 0/I protostellar disk candidates in the Serpens cluster.

SETI

Technosignatures in Transit

Technosignatures in Transit

Kepler, K2, TESS, and similar time-domain photometric projects, while designed with exoplanet detection in mind, are also well-suited projects for searches for large artificial structures orbiting other stars in the Galaxy.

SETI

Technosignatures in the Thermal Infrared

Technosignatures in the Thermal Infrared

WISE, Gaia, and JWST provide an opportunity to compute the first robust upper limits on the energy supplies of extraterrestrial civilizations, both for stars in the Galaxy (Kardashev Type II civilizations) and for other galaxies (Kardashev Type III civilizations).

SETI

Searches for Technosignatures in Astronomy and Astrophysics

Searches for Technosignatures in Astronomy and Astrophysics

The search for life beyond the Solar System-a major part of the Planetary Systems thematic area of the Astro2020 Decadal process-includes the search for technological life.

SETI

Searches for Technosignatures: The State of the Profession

Searches for Technosignatures: The State of the Profession

The search for life in the universe is a major theme of astronomy and astrophysics for the next decade.

Habitable Zones & Global Climate

Role of Planetary Obliquity in Regulating Atmospheric Escape: G-dwarf vs. M-dwarf Earth-like Exoplanets

Role of Planetary Obliquity in Regulating Atmospheric Escape: G-dwarf vs. M-dwarf Earth-like Exoplanets

We present a three-species multi-fluid MHD model (H+, O+ and e−), endowed with the requisite upper atmospheric chemistry, that is capable of accurately quantifying the magnitude of oxygen ion losses from "Earth-like" exoplanets in habitable zones, whose magnetic and rotational axes are roughly coincidental with one another.

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