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Letter from the editor

Astrobiology (Overview)

"Astrobiology is organized around a core of fundamental questions: When, where, and how did life arise on Earth? Has it arisen anywhere else? What physicochemical conditions are required to generate life and to sustain it? How do planetary, stellar, and cosmic processes—and the activity of life itself—shape the distribution of these conditions across time and space? What can be said about the likely characteristics of extraterrestrial life, and what, therefore, are the optimal strategies for finding it? ..." – By Sean McMahon

Clouds in the Martian Atmosphere

"Although resembling an extremely dry desert, planet Mars hosts clouds in its atmosphere. Every day somewhere on the planet a part of the tiny amount of water vapor held by the atmosphere can condense as ice crystals to form cirrus-type clouds. ..." – By Anni Määttänen and Franck Montmessin

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