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Uka unu (M ) bụ otu ọkọlọtọ nke oke na mbara igwe, nhata ihe dịka 2× 10 30 .  n'arọ .  Ọ bụ ihe nhata na oke ego .  A na-egosi ya egosi oke ndị ọzọ, yana ọrịa, nebulae, mkpọ na oghere ojii .  Nke a ruru ihe dị ka nonillion ( ọnụ ọgụgụ dị isi ), kilogram abụọ quintillion ( ogologo ọnụ ọgụgụ ), 2000 quettagrams, ma ọ bụ 2 quettakilograms.

. [1] [2]Ebu ụzọ nwe uru nke ndòda mgbe niile site na nha nke Henry Cavendish mere na 1798 nwere nguzozi torsion .  [1] Uru ọ dị iche na naanị 1% site na uru nke oge a, mana ọ bụghị nke ziri ezi.  [2] A bụ parallax kwa ụbọchị nke malite nke ọma n'oge ngafe nke Venus na 1761 na 1769, [3] na-enye uru nke 9″ (9).  arcseconds, ma e jiri ya ike uru dị ugbu a nke 8.794148 ″).  Site na uru nke parallax nke ụbọchị ọlụ, mmadụ nwere ike ike ebe dị anya na Sun site na geometry nke m

[3]Atụmatụ mbụ amara nke mbụ bụ Isaac Newton .  [1] N'akwa ya Principia (1687), o mere na oke nke ụwa na ihe bụ ihe dịka.  .  Mgbe e ahụ, ọ bụ na uru ya gbadoro ụkwụ na uru na-akụzi ezi maka parallax, bụ nke o jiworo anya ebe dị anya na ọmụmụ.  Ọ gbaziri nha ya  na akara nke atọ nke Principia .  Uru dị ugbu a maka parallax dị obere ka, na-enye egwu oke nke

  1. Barbieri (2007). Fundamentals of astronomy. CRC Press, 132–140. ISBN 978-0-7503-0886-1. 
  2. How do scientists measure or calculate the weight of a planet? (en). Scientific American. Retrieved on 2020-09-01.
  3. Leverington (2003). Babylon to Voyager and beyond: a history of planetary astronomy. Cambridge University Press. ISBN 978-0-521-80840-8.