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Astronomers have detected an X-ray signal from the very center of the Helix Nebula, at the site of its central white dwarf star.
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Astronomers have detected an X-ray signal from the very center of the Helix Nebula, at the site of its central white dwarf star. These burned-out stellar remnants don't typically release flashes of X-rays. Now, researchers think that the dead star smashed up one of its surviving planets, and the X-rays are coming from planetary debris that's falling onto its surface. A Neptune-sized planet was already found orbiting the white dwarf, so another could be even closer.
