Extrasolar Planets

Habitable Worlds With JWST: Transit Spectroscopy of the TRAPPIST-1 System?

Habitable Worlds With JWST: Transit Spectroscopy of the TRAPPIST-1 System?

The recent discovery of three Earth-sized, potentially habitable planets around a nearby cool star, TRAPPIST-1, has provided three key targets for the upcoming James Webb Space Telescope (JWST).

Habitable Zones & Global Climate

The Evolution of Galaxy Habitability

The Evolution of Galaxy Habitability

We combine a semi-analytic model of galaxy evolution with constraints on circumstellar habitable zones and the distribution of terrestrial planets to probe the suitability of galaxies of different mass and type to host habitable planets, as well as its evolution with time.

Extrasolar Planets

Impact of Secular Resonances on Habitable Zones in Circumstellar Planetary Systems of Known Binary Stars

Impact of Secular Resonances on Habitable Zones in Circumstellar Planetary Systems of Known Binary Stars

We present a survey on binary star systems with stellar separations less than 100 astronomical units.

Extrasolar Planets

Using Kepler Candidates to Examine the Properties of Habitable Zone Exoplanets

Using Kepler Candidates to Examine the Properties of Habitable Zone Exoplanets

An analysis of the currently known exoplanets in the habitable zones (HZs) of their host stars is of interest in both the wake of the NASA Kepler mission and with prospects for expanding the known planet population through future ground- and space-based projects.

Habitable Zones & Global Climate

Limit Cycles Can Reduce The Width of the Habitable Zone

Limit Cycles Can Reduce The Width of the Habitable Zone

The liquid water habitable zone (HZ) describes the orbital distance at which a terrestrial planet can maintain above-freezing conditions through regulation by the carbonate-silicate cycle.

Origin & Evolution of Life

Solar Storms May Have Been Key to Life on Earth

Solar Storms May Have Been Key to Life on Earth

Our sun's adolescence was stormy-and new evidence shows that these tempests may have been just the key to seeding life as we know it.

Mars

Ancient Tsunami Evidence on Mars Reveals Life Potential

Ancient Tsunami Evidence on Mars Reveals Life Potential

The geologic shape of what were once shorelines through Mars' northern plains convinces scientists that two large meteorites - hitting the planet millions of years apart - triggered a pair of mega-tsunamis.

Biosignatures & Paleobiology

Variability of Earth's Reflectance Over The Last 16 Years

Variability of Earth's Reflectance Over The Last 16 Years

The Earth's albedo, or reflectance, is a fundamental atmospheric parameter having deep implications for temperature and climate change. For that reason, experiments have been performed to monitor it over the past two decades to reveal how it evolves.

Habitable Zones & Global Climate

Habitable Zones of Post-Main Sequence Stars

Habitable Zones of Post-Main Sequence Stars

Once a star leaves the main sequence and becomes a red giant, its Habitable Zone (HZ) moves outward, promoting detectable habitable conditions at larger orbital distances.

Astronomy

Terrestrial Effects Of Nearby Supernovae In The Early Pleistocene

Terrestrial Effects Of Nearby Supernovae In The Early Pleistocene

Recent results have strongly confirmed that multiple supernovae happened at distances ~100 pc consisting of two main events: one at 1.7 to 3.2 million years ago, and the other at 6.5 to 8.7 million years ago.

Europa

Europa's Ocean May Have An Earthlike Chemical Balance

Europa's Ocean May Have An Earthlike Chemical Balance

A new NASA study modeling conditions in the ocean of Jupiter's moon Europa suggests that the necessary balance of chemical energy for life could exist there, even if the moon lacks volcanic hydrothermal activity.

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