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The opening sentence or opening line stands at the beginning of a written work. The opening line is part or all of the opening sentence that may start the lead paragraph . For older texts the Latin term incipit ('it begins') is in use for the very first words of the opening sentence.
Such cometary water is used for terraforming Mars in Frederik Pohl's 1992 novel Mining the Oort; [1] [3] [6] [12] [17] Pohl had earlier touched upon the comet mining theme in the 1980 novel Beyond the Blue Event Horizon (part of his Heechee series), where intelligent aliens systematically harvest the CHON elements (carbon, hydrogen, oxygen, and ...
Coin showing Caesar's Comet as a star with eight rays, tail upward. Non-periodic comets are seen only once. They are usually on near-parabolic orbits that will not return to the vicinity of the Sun for thousands of years, if ever.
The confirmation of the comet's return was the first time anything other than planets had been shown to orbit the Sun. [36] It was also one of the earliest successful tests of Newtonian physics, and a clear demonstration of its explanatory power. [37] The comet was first named in Halley's honour by French astronomer Nicolas-Louis de Lacaille in ...
A great comet appeared in the sky above Europe on 1577 AD. Tycho Brahe decided to try and estimate the distance to this comet by measuring its parallax, the effect whereby the position or direction of an object appears to differ when viewed from different positions. He proposed that comets (like planets) return to their respective positions in ...
The Great January Comet of 1910, named after the date it appeared. Before any systematic naming convention was adopted, comets were named in a variety of ways. Prior to the early 20th century, most comets were simply referred to by the year when they appeared e.g. the "Comet of 1702".
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Comet Hyakutake (formally designated C/1996 B2) is a comet discovered on 31 January 1996. [1] It was dubbed the Great Comet of 1996 ; its passage to within 0.1 AU (15 Gm) of the Earth on 25 March was one of the closest cometary approaches of the previous 200 years.