flying dutchman or space ghost coast-to-coast

As the BBC reports, astronomers from the Max Planck Institute in Heidelberg have discovered the first exo-planet that seems to have originated outside of the Milky Way galaxy. Researchers believed that this planet, found in orbit around an ancient star in a stellar stream, formed before its host dwarf galaxy was absorbed by our own. These wispy bands of red giants are the remnants of once independent galactic bodies. Nothing yet, as with all distant planets, can be determined about is composition, nor is there reason to believe that it would betray any kind of departure from the imagined and the expected, as if anything could be safely assumed about alien worlds--rather, it is more evidence of the abundance of stars hosting planets. It also reminds me of the Martian meteor found in the 1980s in Antarctica. Without even addressing questions of extra-planetary biogenesis and whether the imprints on the rocks surface are fossils, just the fact that material could be ejected or otherwise shrugged off of Mars and travel through space and be captured by Earth's gravity to be found later by rock-hounds at the bottom of the world, just seems amazing and almost lyrical, purposeful and mysterious all at once.