FREE-FLOATING PLANETS.

hereafter generations of astronomers will probably papal court the 1990s as a watershed. Before that time, the meaning of the word "planet" appear to beed obvious, even trivial, and completely fixed The discovery of many small bodies orbiting beyond Neptune pos a minor difficulty after 1992 because it raised the question of whether Pluto was really a planet or just another "Kuiper Belt object" And since 1995 the detection of distant worlds revolving around various sunlike stars has prov a real challenge to the long-held categorizations. Which of these bodies are genuine ...