A moon only 10 kilometres wide was hiding around Uranus for decades. Voyager 2 missed it. Hubble missed it. But in 2025, Webb finally caught the faint speck circling near the planet’s inner rings, raising Uranus’s known moon count to 29.

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Webb's NIRCam detected S/2025 U1 in February 2025, a roughly 10-kilometre inner moon of Uranus too faint for Voyager 2 or Hubble. The post A moon only 10 kilometres wide was hiding around Uranus for decades. Voyager 2 missed it. Hubble missed it. But in 2025, Webb finally caught the faint speck circling near the planet’s inner rings, raising Uranus’s known moon count to 29. appeared first on Space Daily .