Purificacion Lopez-Garcia (Membre de l'Académie des Sciences, DR CNRS Paris-Saclay) et Martin Turbet (LAB Université de Bordeaux). Amphithéâtre B18, 17h30

NASA's Nancy Grace Roman Space Telescope launches Aug. 30 on a mission to explore some of the most pressing mysteries of the cosmos.

The Dynamics of Planetary Ejection, Rice, Malena, DeRocco, William, Raymond, Sean N.

The Gaia mission has allowed researchers to understand the motions of stars like never before, even revealing possible interactions between our solar system and nearby stars. Planetary Science Institu...

The outer regions of AGN disks have temperatures similar to those of circumstellar disks, permitting dust condensation. Therefore, planet formation and growth could be active in these dust tori throug...

An instability among the giant planets' orbits can match many aspects of the Solar System's current orbital architecture. We explore the possibility that this dynamical instability was triggered by th...

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Black Holes, Stars, Earth and Mars: Astronomy poems for all ages [Raymond, Sean, Raymond, Owen, Tyson, Neil deGrasse] on Amazon.com. *FREE* shipping on qualifying offers. Black Holes, Stars, Earth and Mars: Astronomy poems for all ages

Could the Sun’s Orbit Shape Evolution? The connection between our massive star and the tiniest microplankton.

The Nautilus Reading List About the Cosmos: Our writers have read a universe of books on the cosmos. Here are their favorites.

The habitable zones (HZs) of main-sequence stars have traditionally been defined as the range of orbits that intercept the appropriate amount of stellar flux to permit surface water on a planet. Terrestrial exoplanets discovered to orbit M stars in these zones, which are close-in due to decreased stellar luminosity, may also undergo significant tidal heating. Tidal heating may span a wide range for terrestrial exoplanets and may significantly affect conditions near the surface. For example, if heating rates on an exoplanet are near or greater than that on Io (where tides drive volcanism that resurfaces the planet at least every 1 Myr) and produce similar surface conditions, then the development of life seems unlikely. On the other hand, if the tidal heating rate is less than the minimum to initiate plate tectonics, then CO<SUB>2</SUB> may not be recycled through subduction, leading to a runaway greenhouse that sterilizes the planet. These two cases represent potential boundaries to habitability and are presented along with the range of the traditional HZ for main-sequence, low-mass stars. We propose a revised HZ that incorporates both stellar insolation and tidal heating. We apply these criteria to GJ 581 d and find that it is in the traditional HZ, but its tidal heating alone may be insufficient for plate tectonics.

Looking for habitable worlds? Check the ones with extreme swings.

In co-orbital planetary systems, two or more planets share the same orbit around their star. Here we test the dynamical stability of co-orbital rings of planets perturbed by outside forces. We test tw...

In co-orbital planetary systems, two or more planets share the same orbit around their star. Here we test the dynamical stability of co-orbital rings of planets perturbed by outside forces. We test tw...

The recent JWST observations have firmly shown that 3I/ATLAS is a comet—an interesting and anomalous one in some ways, but definitely not a spacecraft. This has not stopped Avi Loeb from continuing to...

Yelling “Tarantulas!” in a crowded movie theater has its time and place. If you’re enduring Madame Web, everyone will be relieved you…

(En español  aquí )  S ummary      Recently, a new interstellar object passing through our solar system has been discovered: 3I/ATLAS. Thi...