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You may find it surprising that the Moon is a source of X-rays. The X-rays are
produced when high energy particles from the Sun (the Solar wind) strike
the Moon's surface. The hemisphere of the Moon that faces into the
Solar wind therefore appears bright in an X-ray image. Notice that the
other hemisphere is darker than the surrounding background. This side of
the Moon is shadowing the background sky which itself glows in X-rays.
These X-rays are produced from hot gas lying between the stars within our