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Hubble is one of the worlds most powerful telescopes . Mercury and the Earth are the only two planets that the Hubble Space Telescope has not observed for astronomical purposes. Mercury is too close to the Sun which is too bright for the Hubble to look at. The Earth is too bright as it clouds reflect the light from the Sun
The Sun is too bright for the Hubble Space Telescope to observe. Its bright light can damage the telescope's sensitive detectors.
