Habitable Zones & Global Climate

The Occurrence of Rocky Habitable Zone Planets Around Solar-Like Stars from Kepler Data

The Occurrence of Rocky Habitable Zone Planets Around Solar-Like Stars from Kepler Data

We present occurrence rates for rocky planets in the habitable zones (HZ) of main-sequence dwarf stars based on the Kepler DR25 planet candidate catalog and Gaia-based stellar properties.

tau Ceti

An Integrated Analysis With Predictions On The Architecture Of The Tau Ceti Planetary System, Including a Habitable Zone Planet

An Integrated Analysis With Predictions On The Architecture Of The Tau Ceti Planetary System, Including a Habitable Zone Planet

tau Ceti is the closest single Sun-like star to the solar system and hosts a multi-planet system with four confirmed planets.

Origin & Evolution of Life

Models For Potential Precursors Of Cells Endure Simulated Early-Earth Conditions

Models For Potential Precursors Of Cells Endure Simulated Early-Earth Conditions

Membraneless compartments--models for a potential step in the early evolution of cells--have been shown to persist or form, disappear, and reform in predictable ways through multiple cycles of dehydration and rehydration.

Astrochemistry

Scientists Discover New Organic Compounds That Could Have Helped Form The First Cells

Scientists Discover New Organic Compounds That Could Have Helped Form The First Cells

Chemists studying how life started often focus on how modern biopolymers like peptides and nucleic acids contributed, but modern biopolymers don't form easily without help from living organisms.

Astrochemistry

Comets Had Impact In The Start Of Life On Earth

Comets Had Impact In The Start Of Life On Earth

The "Big Bang" may have started the universe but it's likely that littler bangs played a key role in life on Earth, say Albion College physics professor Nicolle Zellner and chemistry professor Vanessa McCaffrey.

Habitable Zones & Global Climate

Hydrogen Dominated Atmospheres On Terrestrial Mass Planets: Evidence, Origin And Evolution

Hydrogen Dominated Atmospheres On Terrestrial Mass Planets: Evidence, Origin And Evolution

The discovery of thousands of highly irradiated, low-mass, exoplanets has led to the idea that atmospheric escape is an important process that can drive their evolution.

Extrasolar Planets

HADES RV Programme With HARPS-N aAt TNG XII. The Abundance Signature Of M Dwarf Stars With Planets

HADES RV Programme With HARPS-N aAt TNG XII. The Abundance Signature Of M Dwarf Stars With Planets

Most of our current knowledge on planet formation is still based on the analysis of main-sequence, solar-type stars.

Venus

No Phosphine In The Atmosphere Of Venus

No Phosphine In The Atmosphere Of Venus

The detection of phosphine (PH3) has been recently reported in the atmosphere of Venus employing mm-wave radio observations (Greaves et at. 2020). We here demonstrate that the observed PH3 feature with JCMT can be fully explained employing plausible mesospheric SO2 abundances (~100 ppbv as per the SO2 profile given in their figure 9), while the identification of PH3 in the ALMA data should be considered invalid due to severe baseline calibration issues.

Titan

Surface Energy Of The Titan Aerosol Analog

Surface Energy Of The Titan Aerosol Analog "Tholin"

The photochemical haze produced in the upper atmosphere of Titan plays a key role in various atmospheric and surface processes on Titan.

Mars

Geologists Simulate Soil Conditions To Help Grow Plants On Mars

Geologists Simulate Soil Conditions To Help Grow Plants On Mars

Humankind's next giant step may be onto Mars. But before those missions can begin, scientists need to make scores of breakthrough advances, including learning how to grow crops on the red planet.

Meteorites, Asteroids, & Comets

The Hamburg Meteorite Contains Pristine Extraterrestrial Organic Compounds

The Hamburg Meteorite Contains Pristine Extraterrestrial Organic Compounds

In the night of January 16, 2018, a fireball meteor streaked across the sky over the Midwest and Ontario before landing on a frozen lake in Michigan.

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