Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. XMM 's three huge telescope barrels each hold 58 concentric cylindrical mirrors, together totaling a surface area rivaling a tennis court . The XMM satellite also carries a small optical and ultraviolet telescope. XMM 's unusually elliptical orbit around the Earth peaks nearly one-third of the way to the Moon.
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