Astrobiology34- Page

Maximum likelihood phylogenomic tree of 381 cyanobacterial genomes, including newly sequenced genomes labeled in bold. The tree was inferred from 46,754 unambiguously aligned sites under the best-fit model (LG+F+I+R10) and

A sketch of the proposed scenario. Oxidized planetesimals decay to near 1 au, accreting onto proto-Earth and proto-Venus as well as forming Mars. Some oxidized planetesimals and aubrite-like planetesimals remain

Planets composed of iron, rock, and water. Illustrations not to scale. The planet model on the left-hand side develops a shallow layer of pure water, while the majority of the

C.1: Same as Figure 4 but for the tidal temperature. These values are compared with the equilibrium temperature of all planets (full black circles) and the brightness temperature of T-1b

The multiple roles of methanogens in the modern-day carbon cycle. Processes shown in red contribute to greenhouse gas production. Part of the methane is removed through microbial methane oxidation (A)MO

Design of the space exposure unit and assemblage of samples for the space exposure experiment (A) The space exposure unit with a UV-blocking filter installed. A UV-blocking filter, which only

(A) Predicted pO2 (red line) and (B) pCO2 (purple line) values are compared for a range of possible assumed pN2. Vertical dashed lines and colored bands reflect pN2 estimates for

A rendering of a lunar lander of the European Space Agency’s Argonaut program, which has its first mission to the moon scheduled for 2030. Methane released from spacecraft like these

Keith’s note: I got this update by text from Dale early this morning: Hi Keith, We arrived 6pm UTC Tuesday evening to a bright, sunny windless day with air temps

Comparison of the star properties of “K dwarfs” to Sun-like “G dwarfs” (third and fourth from left). Reproduced through CC-licensing from the work by J.-V. Harre and R. Heller (2021,