We review the field of exoplanetary biosignatures with a main focus upon atmospheric gas-
phase species. Due to the paucity of data in Earth-like planetary atmospheres a common …

Abstract e-ASTROGAM ('enhanced ASTROGAM') is a breakthrough Observatory space
mission, with a detector composed by a Silicon tracker, a calorimeter, and an …

Nitrogen dioxide (NO 2) on Earth today has biogenic and anthropogenic sources. During the
Covid-19 pandemic, observations of global NO 2 emissions have shown a significant …

Technosignatures refer to observational manifestations of technology that could be detected
through astronomical means. Most previous searches for technosignatures have focused on …

The presence of chlorofluorocarbons (CFCs) in Earth's atmosphere is a direct result of
technology. Ozone-depleting CFCs have been banned by most countries, but some CFCs …

In this article, we address the cosmic frequency of technological species. Recent advances
in exoplanet studies provide strong constraints on all astrophysical terms in the Drake …

We estimate the relative likelihood of success in the searches for primitive versus intelligent
life on other planets. Taking into account the larger search volume for detectable artificial …

The search for extra-terrestrial intelligence (SETI) has for sixty years attempted to solve
Fermi's paradox: if intelligent life is relatively common in the universe, where is everybody …

It is well known that the chances of success of the search for extraterrestrial intelligence
depend on the longevity of technological civilizations or, more broadly, on the duration of the …

In view of the promising advancements in technosignature science, the question of what
constitutes a robust technosignature is rendered crucial. In this paper, we first delineate a …