You are mistaken to think that Andromeda is a planet. It is in fact a galaxy located in the night sky in the constellation of Andromeda.
The Andromeda Galaxy, also known as Messier 31 is the closest spiral galaxy approximately 2,500,000 light-years away.
The closest galaxy to the Milky Way is the Andromeda galaxy.
Andromeda and the Milky Way are approximately 2.5 million lightyears apart, and are constantly nearing each other. The Milky Way measures about 100,000 lightyears across, and Andromeda is roughly 220,000 lightyears.
Messier 31 or M31 or the Andromeda Galaxy is the nearest large spiral galaxy to Earth.It is commonly assumed wrongly to be the closest galaxy to our own but other smaller galaxies are closer. In fact it is the 35th nearest galaxy to us.The Canus Major Dwarf Galaxy is thought to be closest at 42,000ly from the galactic core and 25,000ly from earth. It is infact closer to the solar system than the galactic core of the Milky Way. (Satellite of Milky Way)Sagillarius Dwarf Eliptical Galaxy is 50,000ly from the core and 70ly from Earth. (Satellite of Milky Way)Large Magellanic Cloud is 157,000 ly from the core. (Satellite of Milky Way)Bootes I Dwarf Galaxy is 197,000ly from the core. (Satellite of Milky Way)Small Magellanic Cloud is 206,000ly from the core. (Satellite of Milky Way)Ursa Minor Dwarf Galaxy is 206,000ly. (Satellite of Milky Way)Draco Dwarf Galaxy is 258,000ly. (Satellite of Milky Way)Sextans Dwarf Galaxy is 281,000ly. (Satellite of Milky Way)Sculptor Dwarf Galaxy is 287,000ly. (Satellite of Milky Way)Ursa Major I Dwarf Galaxy is 330,000ly. (Satellite of Milky Way)Carina Dwarf Galaxy is 330,000ly. (Satellite of Milky Way)Fornax Dwarf Galaxy is 460,000ly. (Satellite of Milky Way)Leo II Dwarf Galaxy is 701,000ly. (Satellite of Milky Way)Leo I Dwarf Galaxy is 820,000ly. (Satellite of Milky Way)Leo T Dward Galaxy is 1,370,000ly. (Satellite of Milky Way)Phoenix Dwarf Galaxy is 1,440,000ly. (Satellite of Milky Way)Barnard's Galaxy is 1,630,000ly. (Satellite of Milky Way)MGC1 star cluster is 2,000,000ly. (Isolated Cluster)NGC 185 Dwarf Galaxy is 2,010,000ly. (Satellite of Andromeda)Andromeda II Dwarf Galaxy is 2,130,000ly. (Satellite of Andromeda)IC 10 Galaxy is 2,200,000ly. (Satellite of Andromeda)NGC 147 Dwarf Galaxy is 2,200,000ly. (Satellite of Andromeda)Leo A Dwarf Galaxy is 2,250,000ly. (Satellite of Milky Way)IC 1613 Dwarf Irregular Galaxy is 2,350,000ly. (Satellite of Andromeda)Andromeda I Dwarf Galaxy is 2,430,000ly. (Satellite of Andromeda)Andromeda III Dwarf Galaxy is 2,440,000ly. (Satellite of Andromeda)Cetus Dwarf Galaxy is 2,460,000ly. (Satellite of Andromeda)M32/ Le Gentil Dwarf Eliptical Galaxy is 2,480,000ly. (Satellite of Andromeda)Cassiopeia Dwarf Galaxy/Andromeda VII 2,490,000ly. (Satellite of Andromeda)Andromeda IX Dwarf Galaxy is 2,500,000ly. (Satellite of Andromeda)LGS 3 Dwarf Irregular Galaxy is 2,510,000ly. (Satellite of Triangulum)Andromeda V Dwarf Galaxy is 2,520,000ly. (Satellite of Andromeda)Pegasus Dwarf Galaxy/Andromeda VI is 2,550,000ly. (Satellite of Andromeda)Andromeda VIII Galaxy is 2,560,000ly. (Satellite of Andromeda)M31/ Andromeda Galaxy is 2,560,000ly.M33/ Triangulum Galaxy is 2,640,000ly.
There are no smaller galaxies in the Andromeda galaxy. In the Local group of galaxies to which Andromeda and the Milky Way are part of, there are around 30 smaller galaxies,
milky way =] i think
andromeda(m31) Lmc Smc.
the milky way
andromeda and milky way (us) maybe moving in the same direction but the milky way is the smaller and 'lighter' so we may be moving faster than the 'bulky' andromeda galaxy hence why there is a strongly suggested theory that we may collide but not in our lifetime. hope this helps
Andromeda Galaxy is the nearest spiral galaxy to our Milky Way Galaxy. It is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 30 other smaller galaxies.
If the Milky way and Andromeda does in fact collide (the accuracy of the prediction is not accurate enough to confirm certainty), then we can expect one of two outcomes.Andromeda envelopes our galaxy and together they form a much larger elliptical galaxy.They pass right past each other, with the gravity of Andromeda "stealing" part of our galaxy which would lead to our solar system being ejected from the Milky way or forming part of Andromeda. (by that time our Sun would have, or could have gone Red Giant already)
We expect the Andromeda galaxy to be just like our own Milky Way galaxy. We can see stars (suns) in the Andromeda Galaxy and just as stars have planets orbiting them in our galaxy, we believe that there must be planets also orbiting stars in the Andromeda galaxy.
The closest galaxy that has planets is the Andromeda galaxy. It is the nearest galactic neighbor to the earth. The Milky Way has other planets too.