comet

(redirected from Dirty snowball)
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Words related to comet

(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

References in periodicals archive ?
Scientists had expected to see a dirty snowball coated with thick layers of dark dust which would obscure any interesting features.
And then we add dry ice and make a frozen, dirty snowball.
The comet--and perhaps many others--may resemble an icy dirt ball more than it does a dirty snowball, says Lisse.
But, Ganymede looks like a dirty snowball next to Jupiter, the largest planet in our solar system.
Whipple, in search of a new paradigm to better explain cometary phenomena, suggested that their nuclei are frozen water, ammonia, methane, carbon monoxide, and carbon dioxide combined with fine-grained meteoritic materials that come together at extremely low temperatures to form a big dirty snowball.
Eight years after Comet Hale-Bopp passed through the inner solar system, the dirty snowball is still active despite being a whopping 21 astronomical units from the Sun.
In 1951, he suggested that comets contain large amounts of ice interspersed with dust--a theory that became known as the dirty snowball model.
Clean snowballs (as opposed to dirty snowballs, or "comets") of more than five or six words in length seem to be difficult to construct, which is why I am impressed with this rather immaculate eight-word snowball contributed by Jeff Grant to a recent Kickshaws: