▁of ▁light ▁as ▁her ▁cod ename ▁suggested ▁and ▁her ▁top ▁speed ▁remains ▁unknown , ▁but ▁it ▁was ▁supposed ▁by ▁her ▁brother ▁Alex ▁on ▁one ▁occasion ▁that ▁she ▁had ▁broken ▁the ▁sound ▁bar rier . ▁ ▁Jul ie ▁gained ▁the ▁density ▁powers ▁previously ▁held ▁by ▁her ▁brother ▁Jack ▁for ▁a ▁time ▁and ▁operated ▁under ▁the ▁name ▁M ole cul a . ▁She ▁expanded ▁upon ▁her ▁new ▁powers ▁by ▁learning ▁to ▁create ▁force ▁fields ▁and ▁b ub bles , ▁the ▁latter ▁of ▁which ▁could ▁be ▁employed ▁to ▁c ush ion ▁herself ▁or ▁others ▁from ▁falls . ▁Jul ie ▁also ▁learned ▁to ▁make ▁herself ▁t aller ▁and ▁larger ▁without ▁transform ing ▁into ▁a ▁cloud ▁- ▁though ▁she ▁still ▁retained ▁the ▁same ▁mass ▁and ▁would ▁become ▁tired ▁when ▁increasing ▁her ▁height ▁and ▁stat ure ▁for ▁long ▁periods ▁of ▁time . ▁ ▁Jul ie ▁eventually ▁reg ained ▁her ▁original ▁acceleration ▁powers ▁and ▁continued ▁as ▁a ▁member ▁of ▁Power ▁Pack ▁under ▁her ▁original ▁cod ename , ▁L ights pe ed . ▁ ▁She ▁did ▁not ▁develop ▁any ▁new ▁permut ations ▁of ▁- ▁or ▁applications ▁for ▁- ▁this ▁ability , ▁however , ▁until ▁after ▁she ▁changed ▁her ▁cod ename ▁once ▁again , ▁this ▁time ▁to ▁Star stre ak . ▁Just ▁as ▁she ▁expanded ▁her ▁mass - cont rolling ▁ab ilities ▁as ▁M ole cul a , ▁Jul ie ▁eventually ▁ref ined ▁her ▁original ▁ab ilities ▁so ▁she ▁could ▁tele port ▁over ▁great ▁distances ▁without ▁any ▁visible ▁sign ▁of ▁exhaust ion . ▁ ▁In ▁un re ve aled ▁circumstances ▁at ▁some