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kas ir hidra
4, 2006, 18:05Nauris
:-:

    Grieķu mitoloģijā par hidru sauca briesmīgu daudzgalvainu čūsku, kuras galvas atauga, tiklīdz bija nocirstas. Atnāca ļaunais Hērakls un nonāvēja šo reto dzīvnieku. Lai galvas neataugtu, Hērakls nopostīja tuvējo mežu to aizdedzinot, tādējādi nokaudams daudz nevainīgas dzīvības un atņemdas daudziem to mājokli. Pēc katras nocirstās galvas viņš cirtiena vietu piededzināja ar degošu koku. Šis bija viens no Herakla divpadsmit varoņdarbiem.
    6, 2006, 17:44Glabātājs

    Hidra (latīniski – Hydra) ir visgarākais debess zvaigznājs, kā arī aizņem visvairāk vietas pie debesīm. Ir jāpaiet vairāk kā sešām stundām, lai Hidra pilnībā uzlēktu. Hidras ziemeļpusē atrodas zodiaka zvaigznāji – Vēzis, Lauva, Jaunava un Svari.

    Hidras spožākā zvaigzne ir Alfards (Vientuļnieks).

    No: http://www.astr.lu.lv/Club/pav_debesis.htm

    6, 2006, 17:48Zvaigžņu pētnieks

    Hidras ir zarndobumaiņu tipa (Cnidaria) hidrozoju klases (Hydrozoa) pārstāvji. Zarndobumaiņi ir Latvijā maz pētīta grupa. Pašlaik konstatētas 5 hidrozoju sugas. No tām trijās ir vārds hidra (iespējamas vēl 3-4 hidru sugas):
    • zaļā hidra (Chlorohydra viridissima Schulze, 1914);
    • garkāta hidra (Hydra oligactis Pallas, 1766);
    • pelēkā hidra (Hydra vulgaris Pallas, 1766);
    • šķeltzobainā obēlija (Hartlaubella gelatinosa Pallas, 1776);
    • Kaspijas kardilofora (Cordylophora caspia Pallas, 1771);

    No http://www.lubi.edu.lv/LES/Cnidaria.htm

    6, 2006, 18:24Dabas pētnieks
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