Habitable Zones & Global Climate

The Origin Of Earth's Water

The Origin Of Earth's Water

A New Physical Model Explains The Origin Of Earth's Water.

Astronomy

Planet-Planet Occultations in TRAPPIST-1 and Other Exoplanet Systems

Planet-Planet Occultations in TRAPPIST-1 and Other Exoplanet Systems

We explore the occurrence and detectability of planet-planet occultations (PPOs) in exoplanet systems. These are events during which a planet occults the disk of another planet in the same system, imparting a small photometric signal as its thermal or reflected light is blocked.

Field Reports

Astrobiologist Dale Andersen Antarctic Status Report 15 November 2017: Deploying Instruments

Astrobiologist Dale Andersen Antarctic Status Report 15 November 2017: Deploying Instruments

Dale Andersen sent this message from: Lat -71.332844 Lon 13.453746 on 15 November 2017 11:29:14 AM EST: Hi Keith: We had another productive day with good weather here at Lake Untersee. Our skies were clear and with the exception of a couple of hours, the winds were light which made working outside on the lake much easier.

Geobiology

When Water Met Iron Deep Inside the Earth

When Water Met Iron Deep Inside the Earth

Reservoirs of oxygen-rich iron between the Earth's core and mantle could have played a major role in Earth's history, including the breakup of supercontinents, drastic changes in Earth's atmospheric makeup, and the creation of life, according to recent work from an international research team published in National Science Review.

Extrasolar Planets

Closest Temperate World Orbiting A Quiet Star Discovered

Closest Temperate World Orbiting A Quiet Star Discovered

A team working with ESO's High Accuracy Radial velocity Planet Searcher (HARPS) at the La Silla Observatory in Chile has found that the red dwarf star Ross 128 is orbited by a low-mass exoplanet every 9.9 days.

Proxima Centauri b

Exocomets in the Proxima Centauri System and Their Importance for Water Transport

Exocomets in the Proxima Centauri System and Their Importance for Water Transport

The scenario and the efficiency of water transport by icy asteroids and comets are still amongst the most important unresolved questions about the early phases of planetary systems.

Analog Studies

Astrobiologist Dale Andersen Antarctic Status Report 14 November 2017: Setting Up Camp

Astrobiologist Dale Andersen Antarctic Status Report 14 November 2017: Setting Up Camp

Dale Andersen sent this message via Iridium satphone on 14 November 2017 1:09:15 PM EST Hi Keith: We are settling in and our camp is fully operational - all the tents up, gear more or less sorted and science equipment has been opened and we are starting to work on the various tasks at hand.

Astrochemistry

HNCO: A Molecule Traces Low-velocity Shock

HNCO: A Molecule Traces Low-velocity Shock

Using data from MALT90 (Millimetre Astronomy Legacy Team Survey at 90 GHz), we present molecular line study of a sample of ATLASGAL (APEX Telescope Large Area Survey of the Galaxy) clumps.

Europa

Galileo Ionosphere Profile Coincident With Repeat Plume detection Location at Europa

Galileo Ionosphere Profile Coincident With Repeat Plume detection Location at Europa

The location of a repeat plume detected at Europa is found to be coincident with the strongest ionosphere detection made by Galileo radio occultation in 1997.

Astrochemistry

The Formation of Urea in Space

The Formation of Urea in Space

Many organic molecules have been observed in the interstellar medium thanks to advances in radioastronomy, and very recently the presence of urea was also suggested. While those molecules were observed, it is not clear what the mechanisms responsible to their formation are.

Impact events

Site of Asteroid Impact Changed the History of Life on Earth

Site of Asteroid Impact Changed the History of Life on Earth

An asteroid, also known as the Chicxulub Impactor, hit Earth some 66 million years ago, causing a crater 180 km wide. The impact of the asteroid heated organic matter in rocks and ejected it into the atmosphere, forming soot in the stratosphere.

More top stories from November.