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parsec n.【天文學】秒差距(天體距離單位,=3.26光年)。

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First , the improvement in the connection building time and improvement based on hypothesis makes the existing smacs protocol suitable for the wsn . and the paper proves this statement by using the parsec software 通過仿真軟件ns對smac協議的能耗、延遲、流量等參數進行仿真測試,進一步論證了smac協議的實用性。

This is the apparent magnitude of an object at some standard distance from us . this standard distance is chosen to be about 32 light years 10 parsecs , see below 絕對星等是恒星距離為約32光年或10秒差距請參閱下一節時的星等。

513km s mpc , ie , for a celestial object 1 , 000 , 000 parsec away from us , its recession rate is 513km 1 parsec 3 . 26 light years 513 km s mpc ,即一個距離我們一百萬秒差距的天體,它的退行速度是每秒513公里一秒差距3 . 26光年。

Typically , a cluster of galaxies contains 1000 galaxies within a million parsecs . in a larger scale , clusters group together to form 一個典型的星系團大小約一百萬秒差距,包含大約1000個星系。

It contains about 100 clusters in 100 mpc mega parsec , a million parsecs 眾多星系團又再組成一個橫跨1億秒差距包含100個星系團的