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astrobiologyexistential riskFermi Paradox

We Should Hope Mars Is Completely Dead — Here's Why

If Mars once had life, it would be the worst news in human history. The Great Filter explains why — and why a dead Mars...

Apr 08, 2026 9 min read Imbrium Editorial Team
dark mattergalactic archaeologygalaxy mergers

87 Ghost Rivers Are Flowing Through the Milky Way

87 streams of stars torn from ancient galaxies thread through the Milky Way. They are fossil rivers — evidence of collisions billions of years old.

Apr 08, 2026 3 min read Imbrium Editorial Team