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                <text>&lt;p&gt;	Anders dan in de traditionele handboeken, die op een schoolse manier een inleiding in de astronomie geven, is in Ontdekkingreis door het heelal gekozen voor een originele, speelse benadering van de sterrenkunde. U wordt uitgenodigd om het heelal te ontdekken door op reis te gaan.&lt;br /&gt;	In plaats van de sterren en planeten per constellatie of in alfabetische volgorde te presenteren, leidt dit boek u als een reisgids door ware ontdekkingstochten langs de hemel. U vindt dertig routes die elk ongeveer een avond in beslag nemen en uit vier tot zes etappes bestaan. Met uw telescoop `bezoekt`u sterren en planeten, lokaliseert u sterrenbeelden en observeert u verscheidene objecten van hetzelfde type en leert hun overeenkomsten en verschillen kennen.&lt;br /&gt;	Deze boeiende en leerzame gids is geillustreetd met een honderdtal foto`s en authentieke sterrenkaarten en is geschikt voor iedereen die op een aangename en interessante manier wil kennismaken met de strerrenkunde.&lt;/p&gt;</text>
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                <text>&lt;p&gt;&lt;span&gt;Anders dan zijn voorganger Dirk Frimout, vertrok Frank de Winne voor zijn ruimtreis vanuit Kazakstan met een Russiche Sojoez-raket. En dat voor een verblijf van zes maanden in het Internationaal Space Station een goeie 400 Km boven het aardoppervlak.&lt;/span&gt;&lt;span&gt; &lt;/span&gt;&lt;/p&gt;
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                <text>&lt;span&gt;Waarom de aarde werkelijk opwarmt&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;De mens is verantwoordelijk voor de opwarming van de aarde. Zo eenvoudig was het. Tot voor kort. Want nu beweert een wetenschapper uit onverdachte hoek dat de mens bar weinig invloed heeft op klimaatverandering.&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;De Deense wetenschapper Henrik Svensmark schreef samen met de Britse wetenschapsjournalist Nigel Calder het baanbrekende boek Kosmisch klimaat - waarom de aarde werkelijk opwarmt. Daarin maakt hij aannemelijk dat niet het opstoken van fossiele brandstoffen, maar kosmische straling (afkomstig van ontplofte sterren) ons klimaat bepaalt.&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;Deze kosmische straling, ontdekte Svensmark tijdens proeven in zijn laboratorium, is van cruciaal belang voor de vorming van lage bewolking boven de oceanen. En die lage bewolking koelt de aarde. Dus: hoe minder kosmische straling hoe meer opwarming.&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;Svensmarks theorie voorspelt niet alleen hoe het klimaat zich zal ontwikkelen, maar verklaart ook de afwisseling van ijstijden en warme periodes in het verleden.&lt;/span&gt;</text>
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                <text>Asfaltspiegelingen, fata morgana's, blinde stroken of zones in de ondergaande zon: het zijn regelmatig optredende hemelverschijnselen die zich in de buurt van de horizon afspelen. Luchtspiegelingen zijn het. Marcel Minnaert heeft in zijn magistrale De natuurkunde van 't vrije veld de aandacht op deze en andere fenomenen gericht en ze met middelbare schoolwiskunde en -natuurkunde van zijn tijd beschreven. We spreken eind jaren dertig van de vorige eeuw.&lt;br /&gt;&lt;br /&gt;
De verschijnselen laten zich goed verklaren in termen van geometrische optica, dat is de theorie van de lichtstralen met daarin onder meer de brekingswet van Snellius. Belangrijk is dat zich in de atmosfeer op zekere hoogte een warmere laag vormt, waarin zowel kaatsing als breking kan optreden. Hierdoor kan in het gezichtsveld van een waarnemer een sector ontstaan rondom de horizontale kijkrichting, waarbinnen de beelden als het ware vervangen worden door beelden achter de horizon. Deze theorie is rond 1920 ontwikkeld door Alfred Wegener.&lt;br /&gt;
Het eerste deel van dit boek behandelt deze theorie vanuit elementaire wiskunde, die enige euclidische meetkunde en differentiaalrekening behelst. De theorie gaat uit van het Principe van Fermat waarbij lichtstralen gekarakteriseerd worden als paden van de kortste tijd. Het blijkt dat Johann Bernoulli's brachistochrone probleem naadloos op deze zelfde wiskunde past. In een tweede deel wordt het Principe van Fermat nader uitgewerkt in termen van de beroemde Ierse wiskundige Hamilton, waarbij variatierekening en differentiaalmeetkunde een belangrijke rol krijgen.&lt;br /&gt;</text>
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