Space Weather

Space Weather-driven Variations in Lyα Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b

Space Weather-driven Variations in Lyα Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b

We simulate the space environment around AU Microscopii b and the interaction between the magnetized stellar wind with a planetary atmospheric outflow for ambient stellar wind conditions and Coronal Mass Ejection (CME) conditions.

Microbiology

830 Million Year Old Microorganisms In Primary Fluid Inclusions In Halit

830 Million Year Old Microorganisms In Primary Fluid Inclusions In Halit

Primary fluid inclusions in bedded halite from the 830-m.y.-old Browne Formation of
central Australia contain organic solids and liquids, as documented with transmitted light and ultraviolet-visible (UV-vis) petrography.

Biosignatures & Paleobiology

The Futility of Exoplanet Biosignatures

The Futility of Exoplanet Biosignatures

The ultimate goal of astrobiology is to determine the distribution and diversity of life in the universe. But as the word "biosignature" suggests, what will be detected is not life itself, but an observation implicating a particular process associated with living systems.

Panspermia

Transfer Of Rocks Between Planetary Systems: Panspermia Revisited

Transfer Of Rocks Between Planetary Systems: Panspermia Revisited

Motivated by the recent discovery of interstellar objects passing through the solar system, and by recent developments in dynamical simulations, this paper reconsiders the likelihood for life bearing rocks to be transferred from one planetary system to another.

Astrochemistry

Extraterrestrial Stone Brings First Supernova Clues To Earth

Extraterrestrial Stone Brings First Supernova Clues To Earth

New chemistry 'forensics' indicate that the stone named Hypatia from the Egyptian desert could be the first tangible evidence found on Earth of a supernova type Ia explosion. These rare supernovas are some of the most energetic events in the universe.

Extrasolar Planets

Can Carbon Fractionation Provide Evidence for Aerial Biospheres in the Atmospheres of Temperate Sub-Neptunes?

Can Carbon Fractionation Provide Evidence for Aerial Biospheres in the Atmospheres of Temperate Sub-Neptunes?

The search for signs of life on other worlds has largely focused on terrestrial planets. Recent work, however, argues that life could exist in the atmospheres of temperate sub-Neptunes.

Alpha Centauri

Simulations Of Astrometric Planet Detection In Alpha Centauri By Intensity Interferometry

Simulations Of Astrometric Planet Detection In Alpha Centauri By Intensity Interferometry

Recent dynamical studies indicate that the possibility of an Earth-like planet around αCen A or B should be taken seriously.

Oceanic Research

The Effect Of Ocean Salinity On Climate And Its Implications For Earth's Habitability

The Effect Of Ocean Salinity On Climate And Its Implications For Earth's Habitability

The influence of atmospheric composition on the climates of present-day and early Earth has been studied extensively, but the role of ocean composition has received less attention.

Mars

New Study Indicates Limited Water Circulation Late In The History Of Mars

New Study Indicates Limited Water Circulation Late In The History Of Mars

A research team led by Lund University in Sweden has investigated a meteorite from Mars using neutron and X-ray tomography. The technology, which will probably be used when NASA examines samples from the Red Planet in 2030, showed that the meteorite had limited exposure to water, thus making life at that specific time and place unlikely.

Plant Biology

Scientists Grow Plants in Lunar Soil

Scientists Grow Plants in Lunar Soil

In the early days of the space age, the Apollo astronauts took part in a visionary plan: Bring samples of the lunar surface material, known as regolith, back to Earth where they could be studied with state-of-the-art equipment and saved for future research not yet imagined.

Extrasolar Planets

Direct Imaging And Spectroscopy Of Extrasolar Planets

Direct Imaging And Spectroscopy Of Extrasolar Planets

Direct imaging and spectroscopy is the likely means by which we will someday identify, confirm, and characterize an Earth-like planet around a nearby Sun-like star.

More top stories from May.