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 Aw gfg fg sfgBy KENNETH CHANG MARCH 12, 2016

G ethzs Internet beginning about an hour before liftoff.

 After a journey of seen !onths, the "#oMars s$a%e%raft &ill arrie atMarsin '%tober.(hree )ays before arriing, the lan)er, na!e) *%hia$arelli after the 1+th%entury Italianastrono!er Gioanni *%hia$arelli, &ill se$arate fro! the orbiter. It is to enter theat!os$here at 1-,000 !iles $er hour an) ui%/ly )e%elerate on its &ay to settling )o&non the surfa%e.g zs

(he !ain obje%tie of *%hia$arelli is to )e!onstrate its lan)ing syste!. (he "uro$ean*$a%e Agen%ys last atte!$t to lan) on Mars  the 3eagle 2 s$a%e%raft, &hi%ha%%o!$anie) the Mars "#$ress orbiter in 200- faile).4

A Russian Proton rocket will carry s 2016 spacecraft. Liftoff is scheduled for Monday in

Kazakhstan.est Cre)it"sa5Getty I!ages*%hia$arelli %arries g fg 2022, %ir%ling Mars at an altitu)e of 20 !iles. Its instru!ents &ill !easure gases, li/e !ethane, &ater a$or an) nitrogen, that e#ist in !inuteuantities but that %oul) hol) i!$ortant %lues about the $ossibility of life on Mars.

Methane is the !ost intriguing tra%e gas. *unlight an) %he!i%al rea%tions brea/ u$!ethane srg heat an) liui) &ater.gr

Mars "#$ress !a)e tenuous )ete%tions of !ethane, but its instru!ents &ere not

sensitig s enough for )efinitie %on%lusionsrgs eg.rg r 7A*As Curiosity roer also)ete%te) a transient &hiff of !ethane in 2018.

9Methane is a hot to$i%,: ;orge sr