Because it's mostly crystalline, astronomers believe the comet originated in the protosolar nebula. Advertisement The new findings, detailed in the Astrophysical Journal, suggest the structure and ...

A comet with a nucleus larger than the state ... The cloud remains a theory because it’s too distant to be observed, so the largest structure in our solar system is essentially invisible.

the ice which we think is in there, is mostly inside." What is the comet's structure like? Video, 00:01:43What is the comet's structure like? Up Next. Scientist with comet landing tattoo.

MIAMI (CBSMiami/CNN) -- The largest comet ever seen ... a theory because it's too distant to be observed, so the largest structure in our solar system is essentially invisible.

The blue false color was added to bring out details in the comet structure. (NASA, ESA, J.-Y. Li (Planetary Science Institute)) Comet Ison, one of the great Astronomical events of the century is ...

The 2.5 mile wide comet on which the Philae lander is meant to land is craggy and covered in dust, says Professor Mark McCaughrean from the European Space Agency. "We thought it was going to be a ...