101. PGJ - PLUTON Percival Lowell (1855/1916) . Indépendamment de Percival Lowell, William Henry Pickering (1858/1938) http://perso.wanadoo.fr/pgj/planetes/pluton.htm

Soleil Mercure Terre Mars ... Galerie Satellite de Pluton : Charon PLUTON / Pluto Clyde Tombaugh, assistant en charge de photographier systématiquement la région du ciel susceptible d'abriter la planète transneptunienne prévue par Lowell, a exposé des photographies de la constellation des Gémeaux (Gemini) prises sur deux nuits, les 23 et 29 Janvier, en utilisant le télescope de 330mm Abbott Lawrence de l'Observatoire Lowell. Puis, observant scrupuleusement les procédures de recherche, Tombaugh a soigneusement regardé, à l'aide d'une machine appelée "comparateur", le mouvement des objets capturés sur le film. La recherche par l'Observatoire Lowell d'une éventuelle neuvième planète a commencé en 1905, sous l'impulsion du fondateur de l'observatoire, Percival Lowell (1855/1916). Lowell étudia surtout Mars et chercha à démontrer l'existence des "canaux". Il envisagea cependant la présence d'une "planète X" au-delà de Neptune, et en indiqua l'orbite probable (1915), d'après certaines perturbations dans le mouvement d'Uranus et de Neptune. Indépendamment de Percival Lowell, William Henry Pickering (1858/1938) suggéra également l'existence d'une planète inconnue au-delà de Neptune, dont il calcula l'orbite.

102. Exploring Mars In The 1800s Percival Lowell (1855 1916) begins observation of Mars at his observatory inFlagstaff, Arizona. That same year, Edward Emerson Barnard (1857 - 1923) http://www.exploringmars.com/history/1800.html

Historical Perspective... The Canal Craze begins! In 1877, Giovanni Virginio Schiaparelli (1835 - 1910) announces that he has seen "cannali" on Mars. If translated correctly, this announcement would have been interpreted as "channels", but with the excitement building over the Suez Canal, it was translated as "canals", and thus began a detour in the history of Mars exploration. THE 1800s (The Canal Craze) Honore Flaugergues, a French amateur astronomer, notices "yellow clouds" on the surface of Mars, which were later found to be dust clouds. Flaugergues notices that the polar ice cap melts significantly in the Martian spring. He concludes that this implies that Mars is hotter than Earth. Wilhelm Beer (1797 - 1850) and Johann von Maedler (1794 - 1874) observe Mars over periods of 759, 1604, and 2234 days, and determine that the rotational period of Mars is 24 hours, 37 minutes, 22.6 seconds, which is surprisingly close to the currently accepted value of 24 hours, 37 minutes, 22.7 seconds. William Whewell concludes that Mars has green seas and red land, and wonders if there is exterrestrial life.

103. Amy Lowell - Books, Journals, Articles @ The Questia Online Library Subjects, AstronomyObservations, Lowell, Percival18551916 On the PERCIVALLowell And His Biographer road he his grandfather, John Amory Lowell, http://www.questia.com/search/amy-lowell

Questia The World's Largest Online Library Primary Navigation Skip Home Page Search Page Read Page ... Subscribe Page Secondary Navigation Skip About Questia Subscribe Requirements ... Login Search the Library: Advanced Search Put exact phrases in quotes Search within Results by media type: Books Journals Magazines Newspapers Encyclopedia Research Topics We searched for: amy AND lowell we found: results by media type: books: journal articles: magazine articles: newspaper articles: encyclopedia articles: Research Topics on: amy lowell List All Research Topics Amy Lowell books on: amy lowell - 2097 results More book Results: Book by Harley Farnsworth MacNair ; University of Chicago Press, 1945 Subjects: Authors, American20th CenturyCorrespondence Ayscough, Florence Wheelock1878-1942Correspondence Lowell, Amy1874-1925Correspondence FLORENCE AYSCOUGH AMY LOWELL Correspondence of a Friendship FLORENCE AYSCOUGH AMY LOWELL Correspondence of a Friendship...Florence Wheelock Ayscough MacNair and Amy Lowell . Both were members of families, English... Selected Poems of Amy Lowell Book by John Livingston Lowes ; Houghton Mifflin Company, 1928

104. ? http://www.bast.net.cn/kjrw/kxmr/2004/8/18/24659.shtml

105. Les Grands Astronomes Et Scientifiques http://www.astrosurf.com/astrospace/astronome.htm

sommaire « nouveautes « recompenses « livre d'or « ... webmaster « Sous-dossiers Choisissez parmis : Retour Les grands astronomes Adams, John Couch astronome et mathématicien anglais qui découvrit l'existence de Neptune indépendamment des travaux de le Verrier. Arago, Jean-François Dominique astronome et physicien français. Il devient membre de l'Académie des sciences et astronome de l'Observatoire de Paris. C'est lui qui découvrit le phénomène de production du magnétisme par rotation. d'Arrest, Heinrich Louis astronome danois qui assista Galle lorsqu'il observa Neptune pour la première fois. Barnard, Edward Emerson astronome américain qui a découvert une vingtaine de comètes et qui a également découvert un des satellites de Jupiter : Amalthée. Il a découver aussi l'étoile qui porte son nom : Barnard. Bode, Johann Elert (1747-1826) : astronome allemand, connu pour la fausse loi de "Titus-Bode" qui essaie d'expliquer la distance planète - Soleil. Bond, William Cranch (1789-1859) : il fut l'un des premiers astronomes américains. Il

106. $B!V$3$3$N$D$NOG@1!W$NMQ8l=8(J Translate this page The summary for this Japanese page contains characters that cannot be correctly displayed in this language/character set. http://www.cgh.ed.jp/TNPJP/nineplanets/help.html

$BMQ8l=8!J(JGlossary$B!K(J A B C D ... Z A accretion Accumulation of dust and gas into larger bodies such as stars, planets and moons. Adams, John Couch <%A!!(J1819-1892 $B%$%.%j%9$NE7J83X $B$N@h$K$"$kOG@1$N0LCV$r(J $B=i$a$FM=B,$7$^$7$?!J(J24$B:P!K!#(J $B%k%t%'%j%((J $B%,%C%l(J 4k jpg English astronomer and mathematician who, at the age of 24, was the first person to predict the position of a planetary mass beyond Uranus . After Galle confirmed the existance of Neptune based on independent calculations done by Le Verrier , the two became embroiled in a dispute over priority. ( 4k jpg albedo $B%"%k%Y%I(J $BE7BN$KF~ the ratio of the amount of light reflected by an object and the amount of incident light; a measure of the reflectivity or intrinsic brightness of an object (a white, perfectly reflecting surface would have an albedo of 1.0; a black perfectly absorbing surface would have an albedo of 0.0). albedo feature $B%"%k%Y%ICO7A(J $BE7BNLL$NL@0ELOMM!#$3$NL@0E$O!"CO

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