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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

Space Resource Utilization

"Since the beginning of the space age in the 1950s, a multitude of satellites, remote sensing probes, landers, and surface rovers have been sent to destinations beyond our planet. These spacecraft, in conjunction with extraterrestrial samples brought by robotic and human missions and with meteorites collected on Earth, have provided a basic understanding of the geological evolution of the planets and of a number of moons, asteroids, and comets of the Solar System. ..." – By Angel Abbud-Madrid

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