This paper tries to answer 2 basic questions which are: (1st Question) –If it's real that, Mars had immigrated from its original orbital distance (84 mkm) to its new current one (227.9mkm)- So Why Mars had immigrated? (2nd Question)–If Mars Immigration is a fact– Why Titius –Bode Law expresses Mars (current) orbital distance (227.9 mkm) normally without disturbances? Let's remember "Mars Immigration Theory" in following: -Mars original orbital distance was 84 mkm. and Mars had immigrated from it to its current orbital distance 227.9 mkm -Through Mats Motion from 84 mkm to 227.9 mkm, Mars had collided with Venus and then Mars had collided with Earth also. -From the Collisions debris Earth Moon was created –and Mars had found its moons. And the rest debris was attracted by Jupiter and created The Asteroid Belt The Giant-impact hypothesis is in consistency with Mars immigration theory But -Instead of the (Supposed Planet) Theia, Mars itself made the collisions- and caused the Earth –Moon Creation - Mars Immigration Theory solves The difficulties of Giant-impact hypothesis: I.Why Venus Has No Moon? – Because Mars moved from 84 mkm to 227.9 mkm and pushed all debris in its motion direction – far from Venus – but Earth has greater Mass and the debris lost their motion high momentum – so Earth could attract some debris and create its moon II.The Lunar Magma Ocean (LMO) Origin– is Venus – because the moon is created by 3 planets debris (Venus – Earth – Mars) – So their rocks are found in it III.Why The Iron Oxide (Feo) of the Moon= (13%)? Because The rate (13%) is a middle between Mars rate (18%) and the terrestrial mantle (8%). IV.Why Mars diameter is decreased through the history? Because of the collisions – Mars diameter lost around (5%) (and Mars mass also which causes difficulties for Mars gravitation equation) Shortly: the Giant-impact hypothesis supports Mars Immigration Theory Gerges Francis Tawdrous +201022532292