India, Aug. 26 -- In August 2006, the International Astronomical Union voted to redefine what constitutes a full-fledged planet, famously reclassifying Pluto as a "dwarf planet." The decision followed the discovery of similar distant worlds beyond Neptune, spark of a historic debate. Here is a visual journey through Pluto's incredible landscapes and the cosmic discovery that changed its status forever.

Published by HT Digital Content Services with permission from Down to Earth....