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A1689-zD1 was a candidate for the most distant and therefore earliest observed galaxy discovered , based on a photometric redshift. If the redshift, z~7.6, is correct, it would explain why the galaxy's faint light reaches us at infrared wavelengths. It could only be observed with Hubble Space Telescope's ''Near Infrared Camera and Multi-Object Spectrometer'' ''(NICMOS)'' and the Spitzer Space Telescope's ''Infrared Array Camera'' exploiting the natural phenomenon of gravitational lensing: The galaxy cluster Abell 1689, which lies between Earth and A1689-zD1, at a distance of 2.2 billion light-years from us, functions as a natural "magnifying glass" for the light from the far more distant galaxy which lies directly behind it, at 700 million years after the Big Bang, as seen from Earth.〔 ==See also== * IOK-1 * UDFy-38135539 * List of the most distant astronomical objects 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「A1689-zD1」の詳細全文を読む スポンサード リンク
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