In my universe, there are apparently only 30 seconds per minute; "seconds/year ≠ 365.2422×24×60×30" Final travel time from Vega-ish distance answer: 291,097 years I was scanning the Lyra constellation area on Google Earth the other day and found a "most likely" candidate: NGC 6745 These galaxies did not merely interact gravitationally as they passed one another; they actually collided. [ref] And per wiki; NGC 6745 (also known as UGC 11391) is an irregular galaxy about 206 million light-years (63.5 mega-parsecs) away in the constellation Lyra. It is actually a trio of galaxies in the process of colliding. The three galaxies have been colliding for hundreds of millions of years. The only problem with this is: NGC 6745: 1.9E+24 meters distance to Earth travel time: 2,398,637,430,644 years age of the universe: 13,820,000,000 years complicating factor: 173.6 (=travel time/age of universe) conclusion: either the universe is older than we think, or this object is not from NGC5745 So, are there closer candidate "colliding" galaxies? (google google google) Wow! WHAT IS THE CLOSEST GALAXY TO THE MILKY WAY? Closest Galaxy: At present, the closet known galaxy to the Milky Way is the Canis Major Dwarf Galaxy – aka. the Canis Major Overdensity. This stellar formation is about 42,000 light years from the galactic center, and a mere 25,000 light years from our Solar System. This puts it closer to us than the center of our own galaxy, which is 30,000 light years away from the Solar System. ... The Milky Way became the size it is now by eating up other galaxies like Canis Major, and it continues to do so today. And since stars from the Canis Major Dwarf Galaxy are technically already part of the Milky Way, it is by definition the nearest galaxy to us. At only 25,000 light years, and from my interpretation, that "the Milky way is currently colliding with the Canis Major dwarf galaxy", my guess is that we will never know the origin of this asteroid. Kind of reminds me of what Zed said in Men in Black; "We're not hosting an intergalactic kegger down here." Oh yes we are. The galaxies are all drunk, crashing into each other, and sending debris flying every which way. Other globular clusters that orbit the center of our Milky Way as a satellite – i.e. NGC 1851, NGC 1904, NGC 2298 and NGC 2808 – are thought to have been part of the Canis Major Dwarf Galaxy before its accretion.