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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 frozen gases. When heated by the Sun, the gases sublime and produce an atmosphere surrounding the nucleus known as the coma.
The region of lineae at the center of this image is the Annwn Regio. [62] [63] Europa's most striking surface features are a series of dark streaks crisscrossing the entire globe, called lineae (English: lines). Close examination shows that the edges of Europa's crust on either side of the cracks have moved relative to each other.
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The outer retrograde moons are all named after characters from one play, The Tempest; the sole known outer prograde moon, Margaret, is named from Much Ado About Nothing. [ 19 ] Some asteroids , also named after the same Shakespearean characters, share names with moons of Uranus: 171 Ophelia , 218 Bianca , 593 Titania , 666 Desdemona , 763 ...
An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...
"Clue" continues through March 17 at Marcus Performing Arts Center's Uihlein Hall, 929 N. Water St. For tickets, visit marcuscenter.org or call (414) 273-7206. A talkback follows the March 14 ...
In the charted regions of the Solar System, these effects are negligible compared to the gravity of the Sun, but in the outer reaches of the system, the Sun's gravity is weaker and the gradient of the Milky Way's gravitational Galactic Center compresses it along the other two axes; these small perturbations can shift orbits in the Oort cloud to ...