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A figure showing a hypothesized semi-enclosed environment created by post-impact hydrothermal activity. Credit: Sato et al.

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extinction events, Habitable Zones, Impact events, Meteorites & Asteroids

Life Recovered Rapidly After The Chicxulub Impact – A Hydrothermal System May Have Helped

by Keith CowingApril 9, 2025

About 66 million years ago, an asteroid slammed into the planet, wiping out all non-avian dinosaurs and about 70% of all marine species.

At an outcrop north of Sydney, Australia, the research team unearths a rock covered in fossil leaves of the extinct ‘seed fern’ Dicroidium. Credit: C. Mays

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extinction events, Gaia - Planetary Perspectives, Origin & Evolution of Life, Plant Biology, Water/Hycean Worlds & Oceanography

Plants Struggled For Millions Of Years After The World’s Worst Climate Catastrophe

by Keith CowingMarch 7, 2025March 7, 2025

Volcanic Eruption - Grok via Astrobiology.com

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extinction events, Fossils & Paleontology, Habitable Zones, Imaging & Spectroscopy, Impact events, Lava / magma ocean / Volcanic Worlds, Meteorites & Asteroids

Massive Volcanic Eruptions Did Not Cause The Extinction Of Dinosaurs

by Keith CowingDecember 19, 2024December 19, 2024

Rate-induced tipping towards extinction in the Daisyworld model. We initialise the system at the coexistence equilibrium (e5) with a value of L = Lmin. Then, we ramp L towards some new value Lmax, at a speed determined by a dimensionless rate parameter r. Panel (b) shows time series of L(rt), while panels (c) and (d) show time series of αw and αb. When the change is slow enough (green, r = 0.5), the biosphere survives; when it is too fast (red, r = 1), the biosphere collapses. This occurs because the system can enter the basin of attraction of the "dead planet" state, e0, if the change in L is fast enough. The threshold for entering this basin of attraction is the stable manifold of the saddle equilibrium e1 (see also Figure 5 and panel f of Figure 1). In the space of αw,αb, and L, the threshold becomes a two dimensional surface Ws (e1(L)): trajectories which cross it are precisely those which tip. This is shown in panel (a). -- astro-ph.EP

Atmospheres, Climate, Weather, Gaia - Planetary Perspectives, Habitable Zones

Rate-induced Biosphere Collapse In The Daisyworld Model

by Keith CowingOctober 8, 2024October 8, 2024

An underground biovault on the Moon -- Grok via Astrobiology.com

Cryobiology, Extinction events, Gaia - Planetary Perspectives, Genomics, Proteomics, Bioinformatics, Habitable Zones, Life Support Systems, Panspermia, Planetary Protection & Biosafety, Sample Return, Societal Issues, Terraforming & Geoengineering

Safeguarding Earth’s Biodiversity By Creating A Lunar Biorepository

by Keith CowingSeptember 30, 2024September 29, 2024

Extinction events, Fossils & Paleontology, Gaia - Planetary Perspectives, Genomics, Proteomics, Bioinformatics, Impact events, Plant Biology

Flowering Plants Survived The Mass Extinction That Killed The Dinosaurs

by Keith CowingDecember 20, 2023December 20, 2023

This 120 second image of the comet was taken Dec. 2 by an iTelescope 50 mm refractor located at an observatory near Mayhill, New Mexico. The streak below the comet was produced by a rocket body (upper stage) passing through the telescope's field of view during the exposure. Credit: NASA

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Extinction events, Gaia - Planetary Perspectives

Planetary Landscape Dynamics Determined The Evolution Of Biodiversity On Earth

by Keith CowingNovember 29, 2023November 29, 2023

TESS target pixel files for TOI-260 for sector 3 (left), and for TOI-286 for sector 1 ( right). The remaining sectors are shown in Appendix A. The target star is labelled as 1 and marked by a white cross in each case. All sources from the Gaia DR3 catalogue down to a magnitude contrast of 8 are shown as red circles, with the size proportional to the contrast. The SPOC pipeline aperture is overplotted in shaded red squares. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Gaia - Planetary Perspectives, Origin & Evolution of Life

Extreme Heat Is Likely To Wipe Out Earth’s Mammals In The Distant Future

by Keith CowingSeptember 25, 2023September 25, 2023

Astrogeology, Extinction events, Fossils & Paleontology, Impact events, Plant Biology

A Fossil Fruit Shows Ancestors Of Coffee And Potatoes Survived The Cretaceous Extinction

by Keith CowingMarch 3, 2023March 3, 2023

Distance between the measured center of each frame and the theoretical star center for two HR 8799 observations of 2015-07-30 and 2015-07-31. See Table 4 for observation logs. -- astro-ph.IM

Astrogeology, Extinction events, Water/Hycean Worlds & Oceanography

Researchers Find Decrease In Molybdenum Preceded Ancient Mass Extinction On Earth

by Keith CowingNovember 28, 2022