Space Science Digest

First exomoon confirmed around a brown dwarf

First exomoon confirmed around a brown dwarf

The first exomoon has been confirmed, detected around a brown dwarf 73 light-years away. The object is about 0.9 Jupiter masses, blurring the definition of planet vs. moon. This is a historic milestone after decades of searching. The ELT is expected to follow up. The discovery was published July 22, 2026. Multiple articles this week cover the confirmation.

Sources (4)
Updated Jul 27, 2026
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