exoplanet n. A planet outside of Earth’s solar system.
Example Citation:
Astronomers said Wednesday that they had found a miniature version of our own solar system 5,000 light-years across the galaxy — the first planetary system that really looks like our own, with outer giant planets and room for smaller inner planets. …

Sara Seager, a theorist at the Massachusetts Institute of Technology who was not part of the team, said that ‘right now in exoplanets we are on an…