The nucleus is the solid, central part of a comet, formerly termed a dirty snowball or an icy dirtball. A cometary nucleus is composed of rock, dust, and...

became the first comet to be observed in detail by spacecraft, providing the first observational data on the structure of a comet nucleus and the mechanism...

radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers...

massive nucleus size. This is twice as long as the Great Comet of 1811, the previous record holder. Accordingly, Hale–Bopp was dubbed the great comet of 1997...

(3.3 AU; 310 million mi) from the nucleus, showing that Hyakutake had the longest tail known for a comet. The comet was discovered on 30 January 1996...

approached Comet Churyumov–Gerasimenko. Rosetta's Philae lander successfully made the first soft landing on a comet nucleus when it touched down on Comet Churyumov–Gerasimenko...

nebulous envelope around the nucleus of a comet, formed when the comet passes near the Sun in its highly elliptical orbit. As the comet warms, parts of it sublimate;...

documentation of the comet's rapid brightening and the detection of fragmentation in its nucleus. The images obtained provided evidence of the comet's intense interaction...

first trek into the inner Solar System. Its nucleus has an estimated average radius of 2.1 km (1.3 mi). The comet was discovered on 18 March 1973 by Czech...

for nearly one third of all comets. Most of these objects vaporize during their close approach, but a comet with a nucleus radius larger than 2–3 km is...

may also refer to: Active galactic nucleus in astronomy Comet nucleus, the solid, central part of a comet Cell nucleus, a central organelle of a eukaryotic...

nucleus of Encke's Comet is 4.8 km. As its official designation implies, Encke's Comet was the first periodic comet discovered after Halley's Comet (designated...

Probe had captured an image of the comet, from which astronomers also estimated the diameter of the comet nucleus at approximately 5 km (3 mi). Later...

this to occur are: a large and active nucleus, a close approach to the Sun, and a close approach to the Earth. A comet fulfilling all three of these criteria...

Czech-American astronomer Zdenek Sekanina suggested that this indicates that the comet nucleus has been fragmenting, with the fragmentation starting in late March...

hydrogen and methane in the comet nucleus have evaporated away, all that remains is an inert rock or rubble pile. A comet may go through a transition...

lander, Philae, landed on the comet's surface on 12 November 2014, becoming the first spacecraft to land on a comet nucleus. On 30 September 2016, the Rosetta...

reddish colour, as well as a nucleus brighter than any star in the night sky. The Great Comet of 1106 AD was a gigantic comet noticed by observers from all...

the first images from a comet's surface. Several of the instruments on Philae made the first in-situ analysis of a comet nucleus, sending back data regarding...

first time a comet had been photographed. Usherwood's photograph, which has not survived, showed the bright region around the comet's nucleus and a part...

a comet approaches the inner Solar System, solar radiation causes the volatile materials within the comet to vaporize and stream out of the nucleus, carrying...

perihelion, the nucleus of Comet Lovejoy had been estimated to be between 100 and 200 metres (330 and 660 ft) in diameter. Since the comet survived perihelion...

The Comet Nucleus Tour (CONTOUR) was a NASA Discovery-class space probe that failed shortly after its July 2002 launch. It was the only Discovery mission...

larger than the Sun. The comet's nucleus was later estimated at 30–40 km in diameter. In many ways the comet was quite similar to Comet Hale–Bopp: it became...

distance at which a comet has been discovered. With a nucleus diameter of at least 120 km (75 mi), it is the largest Oort cloud comet known. It is approaching...

David Gill, reported watching the comet rise a few minutes before the Sun on 18 September, and described it as "The nucleus was then undoubtedly single, and...

approach of the comet, allow for impacts on Mars, its moons, and orbiting spacecraft. Dust particles ejected from the nucleus of the comet, at more than...

a comet nucleus based on Whipple's icy conglomerate model of H2O ice plus a mixture of other ices and dust. The initial structure of a comet nucleus is...

the coma of 29P when in outburst. The comet nucleus is estimated to be 60.4±7.4 kilometers in diameter. The comet is unusual in that while normally hovering...

considered potentially hazardous to Earth. Simulations indicated it was a comet nucleus that was possibly put into its current orbit after an interaction with...