Part 7/9:
The recent Kepler data showed short-term microlensing events without signs of an associated host star, reinforcing the hypothesis that these are solitary wandering planets. The absence of a secondary signal suggests these planets were once part of planetary systems before being ejected.
Future Prospects and Broader Implications
The discovery underscores a paradigm shift in planetary science. While direct imaging of such small and distant objects remains unfeasible with current technology, ongoing and upcoming missions aim to explore this population further. The upcoming Nancy Grace Roman Space Telescope (formerly WFIRST), for example, will be pivotal in counting and characterizing rogue planets.