Hubble's April and October observations of ISON with computer modeling. The April image has been enlarged to appear comparable in size to the observation of the much-closer ISON in October.

Ison-ratio-scale-v3

Hubble's April and October observations of ISON with computer modeling. A jet is clearly visible in the April image, but missing from the October image. The April image has been scaled up to appear comparable in size to the observation of the much-closer ISON in October.

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ison-ratio-scale-v3.jpg