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Abbasid
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Carl Sagan
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Jacobus Kapteyn
http://academickids.com/encyclopedia/j/ja/jacobus_...
Iraq
http://academickids.com/encyclopedia/i/ir/iraq.htm...
Aristarchus
http://academickids.com/encyclopedia/a/ar/aristarc...
Karl Schwarzschild
http://academickids.com/encyclopedia/k/ka/karl_sch...
Herbert Dingle
http://academickids.com/encyclopedia/h/he/herbert_...
Netherlands
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http://academickids.com/encyclopedia/n/ne/netherla...
Joseph von Fraunhofer
http://academickids.com/encyclopedia/j/jo/joseph_v...
Carl Friedrich Gauss
http://academickids.com/encyclopedia/c/ca/carl_fri...
Zhang Heng
http://academickids.com/encyclopedia/z/zh/zhang_he...
Anders Jonas Ångström
http://academickids.com/encyclopedia/a/an/anders_j...
Yrjo Vaisala
http://academickids.com/encyclopedia/y/yr/yrjo_vai...
Stephen Hawking
http://academickids.com/encyclopedia/s/st/stephen_...
Karl Guthe Jansky
http://academickids.com/encyclopedia/k/ka/karl_gut...
Gerard Kuiper
http://academickids.com/encyclopedia/g/ge/gerard_k...
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