SPHEREx Just Took the Fingerprints of Failed Stars Across Our Cosmic Neighborhood
Illustrative image Brown dwarfs are the black (or brown?) sheep of astronomy. They’re too big to be considered a traditional gas planet, but they are too small to have started nuclear fusion and made the full transition to star-hood. They also change dramatically over time, cooling, shrinking, and spinning faster as they age. Or at least…
Source：Universe Today
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