
Ze wzgledu na ekspansje Wszechswiata, czyli ciagla zmiane odleglosci pomiedzy dwoma wybranymi galaktykami, lub gromadami galaktyk istnieje w kosmologii potrzeba uzywania roznie zdefiniowanych odleglosci. Sa to:
- odleglosc swiatla (ang. light travel distance):
- odleglosc wlasna (ang. proper distance), czyli odleglosc jaka przebywa swiatlo od chwile wyemitowania go przez rozwazany obiekt az do chwili jego obecnej obserwacji:

,
gdzie

to czynnik skali.
- tzw. odleglosc ruchu wlasnego (ang. proper motion distance), czyli odleglosc w jakiej obecnie znajduje sie obserwowany obiekt:

- w przypadku dodatniej krzywizny,

- w przypadku ujemnej krzywizny,
gdzie

jest promieniem krzywizny.
--
GrzegorzNowak - 11 Mar 2004
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[2] [3] [4] [5] [6] (./cUr5Zi9fZy.aux) )
(see the transcript file for additional information)
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Transcript written on cUr5Zi9fZy.log.