An object with the same diameter as Neptune has not been excluded by previous surveys in visible light, and the infrared survey by the Wide-field Infrared Survey Explorer (WISE) would not have seen a Neptune-sized object beyond 700 AU.
An infrared survey by the Wide-field Infrared Survey Explorer (WISE) beyond 700 AU. An object with the same diameter as Neptune has not been excluded by previous surveys.
An object with the same diameter as Neptune has not been excluded by previous surveys. An infrared survey by the Wide-field Infrared Survey Explorer (WISE) beyond 700 AU.
An object with the same diameter as Neptune has not been excluded by previous surveys. An infrared survey by the Wide-field Infrared Survey Explorer (WISE) beyond 700 AU.