Scientists at the University of Colorado are puzzling over what NASA’s Mars Atmosphere and Volatile Evolution Spacecraft (MAVEN) has detected in the red planet’s atmosphere. The northern hemisphere of Mars is unexpectedly shrouded in the glow of an aurora. “What’s especially surprising about the aurora …

Has an advanced alien civilization built a black-hole-powered particle accelerator to study physics at “Planck-scale” energies? And if such a cosmic collider is lurking in a corner of the universe, could we detect it here on Earth? Brian Lacki of the Institute for Advanced Studies …

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