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Riccardo Giacconi
http://academickids.com/encyclopedia/r/ri/riccardo...
George Ogden Abell
http://academickids.com/encyclopedia/g/ge/george_o...
Charles Messier
http://academickids.com/encyclopedia/c/ch/charles_...
Al-Khwarizmi
http://academickids.com/encyclopedia/a/al/al_khwar...
Roger Penrose
http://academickids.com/encyclopedia/r/ro/roger_pe...
Jean Sylvain Bailly
http://academickids.com/encyclopedia/j/je/jean_syl...
Knidos
http://academickids.com/encyclopedia/k/kn/knidos.h...
India
http://academickids.com/encyclopedia/i/in/india.ht...
Alexandria
http://academickids.com/encyclopedia/a/al/alexandr...
Nicolas Louis de Lacaille
http://academickids.com/encyclopedia/n/ni/nicolas_...
Poland
http://academickids.com/encyclopedia/p/po/poland.h...
Tycho Brahe
Tycho Brahe was a Danish nobleman, well known as an astronomer/astrologer and alchemist..
http://academickids.com/encyclopedia/index.php...
Andronicus of Cyrrhus
http://academickids.com/encyclopedia/a/an/andronic...
Henry Norris Russell
http://academickids.com/encyclopedia/h/he/henry_no...
Erasmus Reinhold
http://academickids.com/encyclopedia/e/er/erasmus_...
James Van Allen
http://academickids.com/encyclopedia/j/ja/james_va...
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