THE WOODLANDS, Texas—More than a decade after the International Astronomical Union (IAU) voted to officially reclassify Pluto as a “dwarf planet,” scientists and the public are still hotly debating the decision. Some staunch supporters of Pluto’s full-fledged planethood are renewing calls for the IAU to reverse Pluto’s demotion. Their opponents insist the decision should stand.
Image: Composite of enhanced color images of Pluto (lower right) and Charon (upper left), as viewed by NASA’s New Horizons spacecraft as it passed through the Pluto system on July 14, 2015. Credit: NASA/JHUAPL/SwRI
