Theorized established starter Sirius system (astrophysical analysis)

Sirius system is only 250 million years old — Earth is 18× older — complex life impossible at Sirius

Catalogued: February 15, 2026
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Full Description

The Sirius system formed ~225-250million years ago (Liebert et al., ApJ 2005). Earth is 4.6 billion years old. Complex multicellular life took 3.5+ billion years to evolve on Earth. The Sirius system has existed for only 250 Myr — equivalent to the Permian period on Earth, when land vertebrates were primitive reptiles. Sirius A has a total main sequence lifespan of only 1.64 Gyr, and Sirius B's progenitor lived only ~100 Myr before dying. There has not been enough time for complex life at Sirius. The direction of any transmission must be Earth → Sirius.

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