James Turrell discusses his ongoing land art piece, Roden Crater, created within a pit formed by an extinct volcano in the Arizona desert. ART21: Where are we, right now? TURRELL: Well, right now ...

If it nails its touchdown on the lunar surface, Athena will unpack its payloads, including a Micro-Nova robot named Grace that will hop into a nearby crater and then hop back out. The robot is ...

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Hazards include high levels of volcanic gas, falling volcanic fragments near the vents, unstable crater walls, ground cracking and potential rockfalls — especially around areas that have been ...