The Magellanic clouds are two dwarf galaxies that orbit the Milky Way. There is the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC). They are only visible in the Southern Hemisphere.
The LMC lies about 160,000 light-years away and is about 14,000 light-years across. The SMC is about 200,000 light-years away and is half the size of LMC.
There is a tail of dust that connects to two galaxies. This is evidence of tidal interaction between them i.e. gravitational pull.