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RECOMMENDED READING

Galaxies Far, Far Away Send Us Highest-Energy Cosmic Rays A new study hints that the most energetic particles ever seen come from far beyond the Milky Way.

Ancient Galaxy Clusters Offer Clues about the Early Universe Astronomers can't understand how distant galaxies grew so big so fast.

Alone in a Crowded Milky Way Even a galaxy teeming with star-hopping alien civilizations should still harbor isolated, unvisited worlds—and Earth might be among them.

Alien Supercivilizations Absent from 100,000 Nearby Galaxies The most far-seeing search ever performed for "Dyson spheres" and other artifacts of "astroengineering" comes up empty. Where is everybody?

Do We Live in a Simulation? Chances Are about 50–50 Gauging whether or not we dwell inside someone else's computer may come down to advanced AI research—or measurements at the frontiers of cosmology.

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