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Lefthand photo, courtesy Alan Dyer; righthand photo, Hubble Space Telescope

The image at left, taken Nov. 1 by an amateur astronomer with a ground-based telescope, reveals an unusually large coma of gas and dust [the white and blue-green rings]. The photo also reveals a faint tail flowing from the comet's right side.

The Hubble image at right, taken Nov. 4, shows the heart of the comet. Although the nucleus is too small to see, the central portion of the image reveals the dust near the nucleus. Scientists hope to use this and other Hubble images to determine how big the nucleus is and how much of it was blasted away during the recent outburst.