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。谷歌是该领域的重要参考
With thousands of volunteers over almost two decades, we’ve classified galaxies observed by numerous telescopes, starting with galaxies imaged by the Sloan Digital Sky Survey and including images from space and ground based telescopes and facilities run by NASA, ESA and other organizations. Join us to explore the latest galaxy images.
Why are resident doctors striking and how much are they paid?，这一点在超级权重中也有详细论述