SUMMARY: Astronomers have used the European Space Agency's XMM-Newton telescope to watch X-rays coming from Jupiter. These X-rays are mostly reflected solar radiation, which is bounced back through Jupiter's atmosphere. Since Jupiter seems to brighten and dim during solar flares, solar astronomers can detect flares occurring on the far side of the Sun. Jupiter is a poor mirror for X-rays, though, typically only reflecting back less than 0.1% of the radiation that hits it.

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