▁gravity ▁may ▁dist ort ▁the ▁O ort ▁cloud , ▁but ▁also ▁to ▁higher ▁concentr ations ▁of ▁bright ▁blue ▁gi ants , ▁which ▁live ▁for ▁relatively ▁short ▁periods ▁and ▁then ▁expl ode ▁viol ently ▁as ▁super nov ae . ▁ ▁Gal actic ▁collision ▁and ▁planet ary ▁dis ruption ▁ ▁Although ▁the ▁vast ▁majority ▁of ▁galaxies ▁in ▁the ▁Un iverse ▁are ▁moving ▁away ▁from ▁the ▁Mil ky ▁Way , ▁the ▁And rom eda ▁Gal axy , ▁the ▁largest ▁member ▁of ▁the ▁Local ▁Group ▁of ▁galaxies , ▁is ▁heading ▁toward ▁it ▁at ▁about ▁ 1 2 0   km / s . ▁In ▁ 4   b ill ion ▁years , ▁And rom eda ▁and ▁the ▁Mil ky ▁Way ▁will ▁col lide , ▁causing ▁both ▁to ▁de form ▁as ▁tid al ▁forces ▁dist ort ▁their ▁outer ▁arms ▁into ▁vast ▁tid al ▁t ails . ▁If ▁this ▁initial ▁dis ruption ▁occurs , ▁astronom ers ▁calculate ▁a ▁ 1 2 % ▁chance ▁that ▁the ▁Sol ar ▁System ▁will ▁be ▁pulled ▁out ward ▁into ▁the ▁Mil ky ▁Way ' s ▁tid al ▁tail ▁and ▁a ▁ 3 % ▁chance ▁that ▁it ▁will ▁become ▁grav itation ally ▁bound ▁to ▁And rom eda ▁and ▁thus ▁a ▁part ▁of ▁that ▁galax y . ▁After ▁a ▁further ▁series ▁of ▁gl ancing ▁blow s , ▁during ▁which ▁the ▁lik elihood ▁of ▁the ▁Sol ar ▁System ' s ▁e jection ▁r ises ▁to ▁ 3 0 %, ▁the ▁galaxies ' ▁super mass ive ▁black ▁holes ▁will ▁merge . ▁Event ually , ▁in ▁roughly ▁ 6