Where Are They? — Grok via Astrobiology.com In this paper we consider the extent to which a lack of observations from SETI may be used to quantify the Fermi paradox.

Micrographs of fresh (a) and 6 day old (b) SD1T cells stained with acridine orange at 1000x magnification (500 nm Ex./526 nm Em.). Bright spots (a) were common among cells. Terminal spores

Panoramic view of the Chang’e-5 landing site. Credit: CNSA/CLEP Polycyclic aromatics are ubiquitous in the interstellar medium and meteorites, yet the search for lunar polycyclic aromatics remains a significant challenge.

Nancy Grace Roman Space Telescope Free-floating planets comprise one of the most enigmatic populations of exoplanets in the Galaxy. Though ground-based observations point to a large abundance of these worlds,